Move sw to sw-old and hw to hw-altium, add kicad files

52 files changed, 0 insertions, 2643 deletions

diff --git a/sw/z80/TODO.txt b/sw/z80/TODO.txt
deleted file mode 100644
index 67be671..0000000
--- a/sw/z80/TODO.txt
+++ /dev/null
@@ -1 +0,0 @@
-- fix kernel makefile (currently broken)
diff --git a/sw/z80/arch/include/addresses.h b/sw/z80/arch/include/addresses.h
deleted file mode 100644
index 32f1997..0000000
--- a/sw/z80/arch/include/addresses.h
+++ /dev/null
@@ -1,15 +0,0 @@
-#ifndef __ADDRESSES_H__
-#define __ADDRESSES_H__
-
-#define ADDR_DEV_ROM_L      0x0000
-#define ADDR_DEV_ROM_H      0x2000
-
-#define ADDR_DEV_PIO        0x0010
-#define ADDR_DEV_CTC        0x0020
-#define ADDR_DEV_USART      0x0030
-
-#define ADDR_DEV_MMU
-
-#define ADDR_DEV_RAM        0x8000
-
-#endif
diff --git a/sw/z80/arch/include/sleep.h b/sw/z80/arch/include/sleep.h
deleted file mode 100644
index bd4214b..0000000
--- a/sw/z80/arch/include/sleep.h
+++ /dev/null
@@ -1,14 +0,0 @@
-#ifndef __SLEEP_H__
-#define __SLEEP_H__
-
-#ifndef F_CPU
-#error undefined CPU clock speed
-#endif
-
-#define SLEEP_UNIT ((F_CPU/4)/2)
-
-#include <stdint.h>
-
-void usleep(uint16_t microseconds);
-
-#endif // __SLEEP_H__
\ No newline at end of file
diff --git a/sw/z80/arch/makefile b/sw/z80/arch/makefile
deleted file mode 100644
index 2763c10..0000000
--- a/sw/z80/arch/makefile
+++ /dev/null
@@ -1,27 +0,0 @@
-# Drivers library
-
-LIB     := build/arch.a
-SOURCES := $(wildcard *.c)
-OBJECTS := $(patsubst %.c,build/%.rel,$(SOURCES))
-
-F_CPU := 10000
-
-CC := sdcc
-AR := sdar
-CFLAGS := -mz80 \
-			-Iinclude \
-			-DDEBUG \
-			-DF_CPU=$(F_CPU)
-
-.PHONY: dirs clean
-$(LIB): $(OBJECTS)
-	$(AR) rcs $@ $(OBJECTS)
-
-$(OBJECTS): build/%.rel: %.c $(SOURCES) dirs
-	$(CC) $(CFLAGS) -c $< -o $@
-
-dirs:
-	mkdir -p build
-
-clean:
-	- rm -rd build
diff --git a/sw/z80/arch/sleep.c b/sw/z80/arch/sleep.c
deleted file mode 100644
index 154e7ec..0000000
--- a/sw/z80/arch/sleep.c
+++ /dev/null
@@ -1,16 +0,0 @@
-#include "sleep.h"
-
-void usleep(uint16_t microseconds)
-{
-    __asm
-    pop hl
-loop:
-    ld bc, #SLEEP_UNIT
-unit:
-    nop
-    dec bc
-    jr nz, unit
-    dec hl
-    jr nz,loop
-    __endasm;
-}
\ No newline at end of file
diff --git a/sw/z80/drivers/ctc.c b/sw/z80/drivers/ctc.c
deleted file mode 100644
index 5ac4254..0000000
--- a/sw/z80/drivers/ctc.c
+++ /dev/null
@@ -1,6 +0,0 @@
-#include "ctc.h"
-
-void ctc_control()
-{
-
-}
diff --git a/sw/z80/drivers/include/ctc.h b/sw/z80/drivers/include/ctc.h
deleted file mode 100644
index 80e8b4b..0000000
--- a/sw/z80/drivers/include/ctc.h
+++ /dev/null
@@ -1,6 +0,0 @@
-#ifndef __CTC_H__
-#define __CTC_H__
-
-void ctc_control();
-
-#endif /* __CTC_H__ */
diff --git a/sw/z80/drivers/include/pio.h b/sw/z80/drivers/include/pio.h
deleted file mode 100644
index ee968d7..0000000
--- a/sw/z80/drivers/include/pio.h
+++ /dev/null
@@ -1,52 +0,0 @@
-#ifndef __PIO_H__
-#define __PIO_H__
-
-#include "addresses.h"
-#include <stdint.h>
-
-// DEBUG
-#define PIO_ASM_INTERFACE
-
-// ports
-#define PIO_A       0
-#define PIO_B       1
-
-// registers
-#define PIO_REG_DATA 0
-#define PIO_REG_CTRL 2
-
-#define PIO_REG_DATA_A 0    // (PIO_A | PIO_REG_PORT)
-#define PIO_REG_DATA_B 1    // (PIO_B | PIO_REG_PORT)
-#define PIO_REG_CTRL_A 2    // (PIO_A | PIO_REG_CTRL)
-#define PIO_REG_CTRL_B 3    // (PIO_B | PIO_REG_CTRL)
-
-#define PIO_MODE_BYTE_OUT  0 // mode 0
-#define PIO_MODE_BYTE_IN   1 // mode 1
-#define PIO_MODE_BYTE_BI   2 // mode 2
-#define PIO_MODE_BIT_IO    3 // mode 3
-
-#define PIO_INT_DISABLE         0 
-#define PIO_INT_ACTIVE_HIGH     2 
-#define PIO_INT_AND_MODE        4
-#define PIO_INT_ENABLE          8
-
-/* functions used internally to interface with the device */
-inline void _pio_write(uint8_t reg, uint8_t data);
-inline uint8_t _pio_read(uint8_t reg);
-
-/* the last argument is needed only for IO mode */
-void pio_set_mode(int port, int mode, uint8_t io);
-
-void pio_set_interrupts(int port, int control);
-void pio_set_interrupts_mask(int port, int control, uint8_t mask);
-
-// uint8_t pio_read_data(int port);
-uint8_t pio_read(int port);
-void pio_write(int port, uint8_t data);
-
-inline int pio_read_pin(int port, uint8_t pin);
-inline void pio_write_pin(int port, uint8_t pin);
-
-// TODO: implement mode (in/out/both) and interrupt vector
-
-#endif /* __PIO_H__ */
diff --git a/sw/z80/drivers/include/usart.h b/sw/z80/drivers/include/usart.h
deleted file mode 100644
index 05aeb4a..0000000
--- a/sw/z80/drivers/include/usart.h
+++ /dev/null
@@ -1,158 +0,0 @@
-#ifndef __USART_H__
-#define __USART_H__
-
-#include "addresses.h"
-
-#include <stdint.h>
-#include <string.h>
-
-// baudrate clock divisors
-// values from TL16C550C datasheet (table 9 for 1.8432 MHz crystal)
-#define USART_BAUDRATE_50       2304
-#define USART_BAUDRATE_75       1536
-#define USART_BAUDRATE_110      1047
-#define USART_BAUDRATE_134_5    857
-#define USART_BAUDRATE_150      768
-#define USART_BAUDRATE_300      384
-#define USART_BAUDRATE_600      192
-#define USART_BAUDRATE_1200     96
-#define USART_BAUDRATE_1800     64
-#define USART_BAUDRATE_2000     58
-#define USART_BAUDRATE_2400     48
-#define USART_BAUDRATE_3600     32
-#define USART_BAUDRATE_4800     24
-#define USART_BAUDRATE_7200     16
-#define USART_BAUDRATE_9600     12
-#define USART_BAUDRATE_19200    6
-#define USART_BAUDRATE_38400    3
-#define USART_BAUDRATE_56000    3
-
-// parity
-#define USART_PARITY_NONE       0
-#define USART_PARITY_EVEN       1
-#define USART_PARITY_ODD        2
-
-// stop bits
-#define USART_STOP_BITS_1       10
-#define USART_STOP_BITS_15      15
-#define USART_STOP_BITS_2       20
-
-// word lenght
-#define USART_WORD_LENGTH_5     0
-#define USART_WORD_LENGTH_6     1
-#define USART_WORD_LENGTH_7     2
-#define USART_WORD_LENGTH_8     3
-
-// autoflow
-#define USART_AUTOFLOW_ALL      3
-#define USART_AUTOFLOW_CTS      2
-#define USART_AUTOFLOW_OFF      0
-
-typedef unsigned int        uint;
-typedef volatile uint8_t    register_t;
-
-/* stuctures for usart registers */
-struct IER 
-{
-    volatile uint received_data_interrupt :1;
-    volatile uint transmitter_empty_interrupt :1;
-    volatile uint receiver_line_status_interrupt :1;
-    volatile uint modem_status_interrupt :1;
-    volatile uint reserved :4;
-};
-
-struct IIR
-{
-    volatile uint interrupt_pending :1;
-    volatile uint interrupt_id :3;
-    volatile uint reserved :2;
-    volatile uint fifos :2;
-};
-
-struct FCR
-{
-    volatile uint fifo_enable :1;
-    volatile uint receiver_fifo_rst :1;
-    volatile uint trasmitter_fifo_rst :1;
-    volatile uint dma_mode_select :1;
-    volatile uint reserved :1;
-    volatile uint receiver_trigger :2;
-};
-
-struct LCR
-{
-    volatile uint word_length :2;
-    volatile uint stop_bits :1;
-    volatile uint parity :1;
-    volatile uint even_parity :1;
-    volatile uint stick_parity :1;
-    volatile uint break_control :1;
-    volatile uint divisor_latch_access :1;
-};
-
-struct MCR
-{
-    volatile uint data_terminal_ready :1;
-    volatile uint request_to_send :1;
-    volatile uint out1;
-    volatile uint out2;
-    volatile uint loop;
-    volatile uint autoflow :1;
-    volatile uint reserved :2;
-};
-
-struct LSR 
-{
-    volatile uint data_ready :1;
-    volatile uint overrun_error :1;
-    volatile uint parity_error :1;
-    volatile uint framing_error :1;
-    volatile uint break_interrupt :1;
-    volatile uint transmitter_holder_empty :1;
-    volatile uint transmitter_empty :1;
-    volatile uint fifo_recv_error :1;
-};
-
-struct MSR
-{
-    volatile uint delta_cts :1;
-    volatile uint delta_data_set_ready :1;
-    volatile uint trailing_edge_ring_indicator :1;
-    volatile uint delta_data_carrier_detect :1;
-    volatile uint clear_to_send :1;
-    volatile uint data_set_ready :1;
-    volatile uint ring_indicator :1;
-    volatile uint data_carrier_detect :1;
-};
-
-/* this structure is only for internal use */
-struct _usart_device
-{
-    register_t buffer;  // also used as LSB for divisor latch
-    struct IER IER;
-    struct IIR IIR;
-    struct FCR FCR;
-    struct LCR LCR;
-    struct MCR MCR;
-    struct LSR LSR;
-    struct MSR MSR;
-    register_t scratch;
-};
-
-
-// setup functions (wrappers)
-void usart_set_baudrate(uint16_t baudrate);
-void usart_set_parity(int mode);
-void usart_set_stop_bits(int count);
-void usart_set_word_length(int length);
-void usart_set_autoflow(int mode);
-
-inline void usart_init(uint16_t baudrate, int parity, int stop_bits); 
-
-void usart_transmit(uint8_t data);
-uint8_t usart_receive();
-
-int usart_write(uint8_t *data, size_t size);
-int usart_read(uint8_t *buffer, size_t count);
-
-#endif // __USART__H__
diff --git a/sw/z80/drivers/makefile b/sw/z80/drivers/makefile
deleted file mode 100644
index 65ded58..0000000
--- a/sw/z80/drivers/makefile
+++ /dev/null
@@ -1,24 +0,0 @@
-# Drivers library
-
-LIB     := build/drivers.a
-SOURCES := $(wildcard *.c)
-OBJECTS := $(patsubst %.c,build/%.rel,$(SOURCES))
-
-CC := sdcc
-AR := sdar
-CFLAGS := -mz80 -Iinclude -I../arch/include -DDEBUG
-
-.PHONY: dirs rebuild clean
-$(LIB): $(OBJECTS)
-	$(AR) vrcs $@ $(OBJECTS)
-
-$(OBJECTS): build/%.rel: %.c $(SOURCES) dirs
-	$(CC) $(CFLAGS) -c $< -o $@
-
-rebuild: clean $(LIB)
-
-dirs:
-	mkdir -p build
-
-clean:
-	- rm -rd build
diff --git a/sw/z80/drivers/pio.c b/sw/z80/drivers/pio.c
deleted file mode 100644
index f396e43..0000000
--- a/sw/z80/drivers/pio.c
+++ /dev/null
@@ -1,84 +0,0 @@
-#include "pio.h"
-
-#ifdef PIO_ASM_INTERFACE
-// TODO: set inline
-void _pio_write(uint8_t reg, uint8_t data)
-{
-    __asm
-    ;;  pop function arguments data in h, reg in a (l)
-    pop hl
-    ld a, l
-    ;; add ADDR_DEV_PIO to get the device address
-    add a, #ADDR_DEV_PIO
-    ld c, a
-    ;; load data
-    out (c), h
-    __endasm;
-}
-
-inline uint8_t _pio_read(uint8_t reg)
-{
-    // TODO: check "dec sp"
-    __asm
-    ;; pop function argument
-    dec sp
-    pop hl
-    ld a, l
-    ;; add ADDR_DEV_PIO to get the device address
-    add a, #ADDR_DEV_PIO
-    ld c, a
-    ;; read data
-    in l, (c)
-    ret
-    __endasm;
-}
-
-#else
-
-inline void _pio_write(uint8_t reg, uint8_t data)
-{
-    *((uint8_t *) (ADDR_DEV_PIO + reg)) = data;
-}
-
-inline uint8_t _pio_read(uint8_t reg)
-{
-    return *((uint8_t *) (ADDR_DEV_PIO + reg));
-}
-
-#endif
-
-void pio_set_mode(int port, int mode, uint8_t io)
-{
-    // 0x0F is a control sequence to set mode
-    _pio_write((PIO_REG_CTRL + port), ((mode << 6) | 0x0F));
-
-    // this mode requires an additional argument that sets
-    // a mode for each pin
-    if (mode == PIO_MODE_BIT_IO) {
-        _pio_write((PIO_REG_CTRL + port), io);
-    }
-}
-
-void pio_set_interrupts(int port, int control)
-{
-    // 0x07 is a control sequence to set interrupts
-    _pio_write((PIO_REG_CTRL + port), (control<<4 | 0x07));
-}
-
-void pio_set_interrupts_mask(int port, int control, uint8_t mask)
-{
-    // 0x17 is a control sequence to set interrupts
-    // AND interpret the next byte as a bitmask
-    _pio_write((PIO_REG_CTRL + port),(control | 0x97));
-    _pio_write((PIO_REG_CTRL + port), mask);
-}
-
-uint8_t pio_read(int port)
-{
-    return _pio_read((PIO_REG_DATA + port));
-}
-
-void pio_write(int port, uint8_t data)
-{
-    _pio_write((PIO_REG_DATA + port), data);
-}
diff --git a/sw/z80/drivers/usart.c b/sw/z80/drivers/usart.c
deleted file mode 100644
index 9a5ee38..0000000
--- a/sw/z80/drivers/usart.c
+++ /dev/null
@@ -1,91 +0,0 @@
-#include "usart.h"
-
-static volatile struct _usart_device *_usart = ((struct _usart_device *) ADDR_DEV_USART);
-
-void usart_set_baudrate(uint16_t baudrate)
-{
-    // enable latch access
-    _usart->LCR.divisor_latch_access = 1;
-    _usart->buffer = 0x00FF & baudrate; // LSBs
-    memcpy(&_usart->IER, &(baudrate >>8), 1);
-    // _usart->IER    = 0x00FF & (baudrate >> 8); // MSBs
-    _usart->LCR.divisor_latch_access = 0;
-}
-
-void usart_set_parity(int mode)
-{
-    if (mode == USART_PARITY_EVEN) {
-        _usart->LCR.even_parity = 1;
-    }
-    else if (mode == USART_PARITY_ODD) {
-        _usart->LCR.even_parity = 0;
-    }
-
-     _usart->LCR.parity = (mode == USART_PARITY_NONE) ? 0 : 1;
-}
-
-void usart_set_stop_bits(int count)
-{
-    _usart->LCR.stop_bits = (count == USART_STOP_BITS_1) ? 0 : 1;
-}
-
-void usart_word_length(int length)
-{
-    _usart->LCR.word_length = length;
-}
-
-void usart_set_autoflow(int mode)
-{
-    _usart->MCR.autoflow = (mode == USART_AUTOFLOW_OFF) ? 0 : 1;
-    _usart->MCR.data_terminal_ready = (mode == USART_AUTOFLOW_ALL);
-}
-
-inline void usart_init(uint16_t baudrate, int parity, int stop_bits)
-{
-    usart_set_baudrate(baudrate);
-    usart_set_parity(parity);
-    usart_set_stop_bits(stop_bits);
-    usart_set_autoflow(USART_AUTOFLOW_OFF);
-}
-
-void usart_transmit(uint8_t data)
-{
-    _usart->buffer = data;
-    while (_usart->LSR.transmitter_holder_empty == 0); // wait
-}
-
-uint8_t usart_receive()
-{
-    return _usart->buffer;
-}
-
-int usart_write(uint8_t *data, size_t size)
-{
-    uint8_t *dp = data;
-
-    while (size--) {
-        _usart->buffer = *(dp++);
-        while (_usart->LSR.transmitter_empty);
-    }
-
-    // TODO: do something that actually counts for sent bytes 
-    return size;
-}
-
-int usart_read(uint8_t *buffer, size_t count)
-{
-    uint8_t *bp = buffer;
-    size_t read_count = 0;
-
-    while (count--) {
-        *(bp++) = _usart->buffer;
-        // check for errors
-        if (_usart->LSR.framing_error || _usart->LSR.parity_error) {
-            bp--; // delete last byte (?)
-        } else {
-            read_count++;
-        }
-    }
-
-    return read_count;
-}
diff --git a/sw/z80/kernel/crt0.s b/sw/z80/kernel/crt0.s
deleted file mode 100644
index 00c7da1..0000000
--- a/sw/z80/kernel/crt0.s
+++ /dev/null
@@ -1,103 +0,0 @@
-;--------------------------------------------------------------------------
-;  crt0.s - Generic crt0.s for a Z80
-;
-;  Copyright (C) 2000, Michael Hope
-;
-;  This library is free software; you can redistribute it and/or modify it
-;  under the terms of the GNU General Public License as published by the
-;  Free Software Foundation; either version 2, or (at your option) any
-;  later version.
-;
-;  This library is distributed in the hope that it will be useful,
-;  but WITHOUT ANY WARRANTY; without even the implied warranty of
-;  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-;  GNU General Public License for more details.
-;
-;  You should have received a copy of the GNU General Public License 
-;  along with this library; see the file COPYING. If not, write to the
-;  Free Software Foundation, 51 Franklin Street, Fifth Floor, Boston,
-;   MA 02110-1301, USA.
-;
-;  As a special exception, if you link this library with other files,
-;  some of which are compiled with SDCC, to produce an executable,
-;  this library does not by itself cause the resulting executable to
-;  be covered by the GNU General Public License. This exception does
-;  not however invalidate any other reasons why the executable file
-;   might be covered by the GNU General Public License.
-;--------------------------------------------------------------------------
-
-	.module crt0
-	.globl	_kmain
-
-	.area	_HEADER (ABS)
-	;; Reset vector
-	.org 	0
-	jp	init
-
-	.org	0x08
-	reti
-	.org	0x10
-	reti
-	.org	0x18
-	reti
-	.org	0x20
-	reti
-	.org	0x28
-	reti
-	.org	0x30
-	reti
-	.org	0x38
-	reti
-
-	.org	0x100
-init:
-	;; Set stack pointer directly above top of memory.
-	ld	sp,#0xFFFF
-
-	;; Initialise global variables
-	call	gsinit
-	call	_kmain
-	jp	    _exit
-
-	;; Ordering of segments for the linker.
-	.area	_HOME
-	.area	_CODE
-	.area	_INITIALIZER
-	.area   _GSINIT
-	.area   _GSFINAL
-
-	.area	_DATA
-	.area	_INITIALIZED
-	.area	_BSEG
-	.area   _BSS
-	.area   _HEAP
-
-	.area   _CODE
-
-__clock::
-	ld	a,#2
-	rst	0x08
-	ret
-
-_exit::
-	;; Exit - special code to the emulator
-	ld	a,#0
-	rst	0x08
-1$:
-	halt
-	jr	1$
-
-	.area   _GSINIT
-gsinit::
-	; ld	bc, #l__INITIALIZER
-	ld	a, b
-	or	a, c
-	jr	Z, gsinit_next
-	; ld	de, #s__INITIALIZED
-	; ld	hl, #s__INITIALIZER
-	ldir
-gsinit_next:
-
-	.area   _GSFINAL
-	ret
-
diff --git a/sw/z80/kernel/fs/fd.c b/sw/z80/kernel/fs/fd.c
deleted file mode 100644
index 96603ad..0000000
--- a/sw/z80/kernel/fs/fd.c
+++ /dev/null
@@ -1,255 +0,0 @@
-#include "fs/fd.h"
-#include "fs/fdop.h"
-#include "fs/fs.h"
-
-/* from fd.h */
-struct file_desc fd_table[FD_TABLE_SIZE];
-struct uint8_t  fd_bmap[FD_TABLE_SIZE / 8];
-
-/* File descriptors implementation */
-
-int8_t open(const char *path, uint8_t flags)
-{
-    // TODO
-    return 0; 
-}
-
-size_t ls(int8_t fd, struct dirent *buf, uint8_t all)
-{
-    // TODO
-    return 0; 
-}
-
-size_t find(int8_t fd, struct dirent *buf, const char *name)
-{
-    // TODO
-    return 0; 
-}
-
-int8_t mkdir(int8_t fd, const char *name)
-{
-    // TODO
-    return 0; 
-}
-
-int8_t touch(int8_t fd, const char *name)
-{
-    // TODO
-    return 0; 
-}
-
-int8_t ln(int8_t fd, const char *name)
-{
-    // TODO
-    return 0; 
-}
-
-int8_t seek(int8_t fd, fsize_t pos)
-{
-    // TODO
-    return 0; 
-}
-
-size_t readline(int8_t fd, char *buf, char term)
-{
-    // TODO
-    return 0; 
-}
-
-int8_t print(int8_t fd, const char *str)
-{
-    // TODO
-    return 0; 
-}
-
-size_t read(int8_t fd, void *buf, size_t n)
-{
-    // TODO
-    return 0; 
-}
-
-int8_t write(int8_t fd, const void *buf, size_t n)
-{
-    // TODO
-    return 0; 
-}
-
-void close(int8_t fd)
-{
-    // TODO
-    return 0; 
-}
-
-/* Set of file descriptors operations */
-/* Determines if to use the serial interface or the address space */
-
-/* Address space section */
-
-/* File functions */
-
-size_t as_readline(inode_t inode, fsize_t seek, char *buf, char term)
-{
-    // TODO
-    return 0;
-}
-
-size_t as_print(inode_t inode, fsize_t seek, const char *str)
-{
-    // TODO
-    return 0;
-}
-
-size_t as_append(inode_t inode, fsize_t *seek_ptr, const char *str)
-{
-    // TODO
-    return 0;
-}
-
-size_t as_read(inode_t inode, fsize_t seek, void *buf, size_t n)
-{
-    // TODO
-    return 0;
-}
-
-size_t as_write(inode_t inode, fsize_t seek, const void *buf, size_t n)
-{
-    // TODO
-    return 0;
-}
-
-size_t as_bin_append(inode_t inode, fsize_t *seek_ptr, const void *buf, size_t
-n)
-{
-    // TODO
-    return 0;
-}
-
-/* Directory functions */
-
-size_t as_ls(inode_t inode, struct dirent *buf, uint8_t all)
-{
-    // TODO
-    return 0;
-}
-
-size_t as_find(inode_t inode, struct dirent *buf, const char *name)
-{
-    // TODO
-    return 0;
-}
-
-int8_t as_mkdir(inode_t inode, const char *name)
-{
-    // TODO
-    return 0;
-}
-
-int8_t as_rmdir(inode_t inode, const char *name)
-{
-    // TODO
-    return 0;
-}
-
-int8_t as_touch(inode_t inode, const char *name)
-{
-    // TODO
-    return 0;
-}
-
-int8_t as_rm(inode_t inode, const char *name)
-{
-    // TODO
-    return 0;
-}
-
-int8_t as_ln(inode_t inode, const char *path, const char *name)
-{
-    // TODO
-    return 0;
-}
-
-/* Serial Space section */
-/* Warning, it doesn't switch to the right driver */
-
-/* File functions */
-
-size_t ss_readline(inode_t inode, fsize_t seek, char *buf, char term)
-{
-    // TODO
-    return 0;
-}
-
-size_t ss_print(inode_t inode, fsize_t seek, const char *str)
-{
-    // TODO
-    return 0;
-}
-
-size_t ss_append(inode_t inode, fsize_t *seek_ptr, const char *str)
-{
-    // TODO
-    return 0;
-}
-
-size_t ss_read(inode_t inode, fsize_t seek, void *buf, size_t n)
-{
-    // TODO
-    return 0;
-}
-
-size_t ss_write(inode_t inode, fsize_t seek, const void *buf, size_t n)
-{
-    // TODO
-    return 0;
-}
-
-size_t ss_bin_append(inode_t inode, fsize_t *seek_ptr, const void *buf, size_t
-n)
-{
-    // TODO
-    return 0;
-}
-
-/* Directory functions */
-
-size_t ss_ls(inode_t inode, struct dirent *buf, uint8_t all)
-{
-    // TODO
-    return 0;
-}
-
-size_t ss_find(inode_t inode, struct dirent *buf, const char *name)
-{
-    // TODO
-    return 0;
-}
-
-int8_t ss_mkdir(inode_t inode, const char *name)
-{
-    // TODO
-    return 0;
-}
-
-int8_t ss_rmdir(inode_t inode, const char *name)
-{
-    // TODO
-    return 0;
-}
-
-int8_t ss_touch(inode_t inode, const char *name)
-{
-    // TODO
-    return 0;
-}
-
-int8_t ss_rm(inode_t inode, const char *name)
-{
-    // TODO
-    return 0;
-}
-
-int8_t ss_ln(inode_t, const char *path, const char *name)
-{
-    // TODO
-    return 0;
-}
diff --git a/sw/z80/kernel/fs/fs.c b/sw/z80/kernel/fs/fs.c
deleted file mode 100644
index 584f934..0000000
--- a/sw/z80/kernel/fs/fs.c
+++ /dev/null
@@ -1,236 +0,0 @@
-#include "fs/fs.h"
-#include "fs/users.h"
-#include "fs/dev.h"
-
-/* from users.h */
-struct fs_user c_user;
-
-/* from inode.h */
-inode_t c_inode;
-
-struct fs_dev devices[FS_MOUNT_LIMIT];
-
-/* filesystem basic implementation */
-
-devsize_t fs_block(blk_t block)
-{
-    // TODO
-    return 0;
-}
-
-devsize_t fs_inode(struct fs_inode *buf)
-{
-    struct fs_superblock * sb;
-    devsize_t seek;
-
-    if (FS_USE_ROM(c_inode))
-    {
-        seek = FS_ROM_SPACE;
-        sb = (struct fs_superblock*) seek; 
-
-    } else {
-
-        seek = 0;
-
-        if (c_inode.dev > 0x7)
-            panic("Invalid device");    // TODO, still to implement
-
-        sb = &devices[c_inode.dev].superblock; 
-    }
-
-    if (c_inode.inode >= sb->imap_size)
-    {
-        // TODO, set errno
-        return 0;   // inode doesn't exist
-    }
-
-    seek += sizeof(struct fs_superblock) + 
-            sizeof(struct fs_inode) * c_inode.inode;
-
-    if (FS_USE_ROM(c_inode))
-        *buf = *(struct fs_inode*)seek;
-    else
-    {
-        /* set sio port */
-        sio_port = devices[c_inode.dev].port_no;
-        sio_seek = seek;
-
-        if (sio_read((void *)buf, INODE_META_SIZE) < INODE_META_SIZE)
-        {
-            // TODO, set errno
-            return 0;   // cannot read to device
-        }
-    }
-
-    return seek + INODE_META_SIZE;
-}
-
-/* from fd.h */
-int8_t __fd_new()
-{
-    int8_t fd;
-    for (int8_t = 0; i < FD_TABLE_SIZE / 8; i++)
-    {
-        for (uint8_t bit = 0x80, j = 0; bit > 0; bit >>= 1, j++)
-        {
-            if (!(bit & fd_bmap[i]))
-                return i * 8 + j;
-        }
-    }
-
-    return -1;
-}
-
-/* from fd.h */
-int8_t __open_c_inode(uint8_t flags)
-{
-    /* read meta data */
-    struct fs_inode inode;
-
-    /* init file_desc buffer */
-    struct file_desc desc = {c_inode, 0};
-    
-    desc.begin = fs_inode(&inode);
-    
-    /* bind operations */
-
-    if (flags & OPEN_DIR)
-    {
-        /* dir handler */
-
-        if (inode.type == INODE_TYPE_DIR)
-        {
-            /* bind dir functions */
-            if (FS_USE_ROM(c_inode))
-                /* bind address space functions */
-                FD_BIND_AS_DIR(desc.opers)
-            else
-                /* bind serial space functions */
-                FD_BIND_SS_DIR(desc.opers)
-
-        } else {
-
-            // TODO, set errno
-            return -1;  // not a directory
-        }
-
-    } else if (flags & OPEN_LINK) {
-        
-        /* link handler */
-
-        if (inode.type == INODE_TYPE_LINK)
-        {
-            if (FS_USE_ROM(c_inode))
-                FD_BIND_AS_FILE(desc.opers, flags)
-            else
-                FD_BIND_SS_FILE(desc.opers, flags)
-
-            if (flags & OPEN_ERASE)
-                /* empty file content */
-                __inode_empty(desc.begin);
-
-        } else {
-            
-            // TODO, set errno
-            return -1;  // not a link
-        }
-
-    } else {
-
-        /* file */
-
-        if (inode.type == INODE_TYPE_FILE)
-            ;   // do nothing
-        else if (inode.type == INODE_TYPE_SPECIAL) {
-            
-            // TODO, bind special callbacks
-            
-        } else {
-
-            // TODO, set errno
-            return -1;
-        }
-
-        /* bind operations */
-
-        if (FS_USE_ROM(c_inode))
-        {
-            if (flags & OPEN_BIN)
-                FD_BIND_AS_BINFILE(desc.opers, flags)
-            else
-                FD_BIND_AS_FILE(desc.opers, flags) 
-
-        } else {
-            
-            if (flags & OPEN_BIN)
-                FD_BIND_SS_BINFILE(desc.opers, flags)
-            else
-                FD_BIND_SS_FILE(desc.opers, flags)
-        }
-    }
-
-    /* find a free fd space */
-    
-    int8_t fd = __fd_new();
-
-    if (fd < 0)
-    {
-        // TODO, set errno, fd not available
-
-    } else
-        fd_table[fd] = desc; // copy buffer into the table
-
-    return fd;
-}
-
-inode_t fs_rec_path(const char *path);
-
-inode_t fs_parse_path(const char *path)
-{
-    inode_t ino, cwd = c_inode;
-
-    switch (path[0])
-    {
-        case '0':
-        FS_INODE_NULL(ino)
-        return ino;
-
-        case '/':
-        FS_INODE_ROOT(ino)
-        c_inode = ino;       // set cwd to root
-        path++;
-        break;
-
-        case '~':
-
-        if (path[1] = '/')
-        {
-            c_inode.dev = FS_DEV_ROM;
-            c_inode.inode = c_user.home;  // set cwd to home
-            path += 2;
-        }
-            
-        break;
-   }
-
-   ino = fs_rec_path(path);
-   c_inode = cwd;
-   return ino;
-}
-
-inode_t fs_rec_path(const char *path)
-{
-    devsize_t inode = fs_inode(c_inode.inode); 
-    inode_t rel;
-
-    if (!inode)   // if not exists
-    {
-        FS_INODE_NULL(rel)
-        return rel;
-    }
-
-    // TODO, check if dir or file
-    // TODO, if dir, find name
-    // TODO, set fs_cwd to new inode
-    // TODO, recall fs_rec_path
-}
diff --git a/sw/z80/kernel/include/devices.h b/sw/z80/kernel/include/devices.h
deleted file mode 100644
index a846f9b..0000000
--- a/sw/z80/kernel/include/devices.h
+++ /dev/null
@@ -1,15 +0,0 @@
-#ifndef __DEVICES_H__
-#define __DEVICES_H__
-
-#define ADDR_DEV_ROM_L      0x0000
-#define ADDR_DEV_ROM_H      0x2000
-
-#define ADDR_DEV_USART      0x4000
-#define ADDR_DEV_CTC        0x4100
-#define ADDR_DEV_PIO        0x4200
-
-#define ADDR_DEV_MMU
-
-#define ADDR_DEV_RAM        0x8000
-
-#endif
diff --git a/sw/z80/kernel/include/errno.h b/sw/z80/kernel/include/errno.h
deleted file mode 100644
index 7632269..0000000
--- a/sw/z80/kernel/include/errno.h
+++ /dev/null
@@ -1,35 +0,0 @@
-#ifndef ERRNO_H
-#define ERRNO_H
-
-extern int errno;
-
-#define EPERM       1       /* Operation not permitted */
-#define ENOENT      2       /* No such file or directory */
-#define ESRCH       3       /* No such process */
-#define EINTR       4       /* Interrupted system call */
-#define EIO         5       /* Input/output error */
-#define ENXIO       6       /* Device not configured */
-#define E2BIG       7       /* Argument list too long */
-#define ENOEXEC     8       /* Exec format error */
-#define EBADF       9       /* Bad file descriptor */
-#define ECHILD      10      /* No child processes */
-#define EDEADLK     11      /* Resource deadlock avoided */
-
-#define ENOMEM      12      /* Cannot allocate memory */
-#define EACCES      13      /* Permission denied */
-#define EFAULT      14      /* Bad address */
-
-#define ENOTBLK     15      /* Block device required */
-#define EBUSY       16      /* Device busy */
-#define EEXIST      17      /* File exists */
-
-#define EXDEV       18      /* Cross-device link */
-#define ENODEV      19      /* Operation not supported by device */
-#define ENOTDIR     20      /* Not a directory */
-#define EISDIR      21      /* Is a directory */
-#define EINVAL      22      /* Invalid argument */
-#define ENFILE      23      /* Too many open files in system */
-#define EMFILE      24      /* Too many open files */
-#define ENOTTY      25      /* Inappropriate ioctl for device */
-
-#endif
diff --git a/sw/z80/kernel/include/fs/dev.h b/sw/z80/kernel/include/fs/dev.h
deleted file mode 100644
index 8e550f3..0000000
--- a/sw/z80/kernel/include/fs/dev.h
+++ /dev/null
@@ -1,29 +0,0 @@
-#ifndef DEV_H
-#define DEV_H
-
-#include "types.h"
-
-#define FS_MOUNT_LIMIT 16
-
-struct fs_superblock
-{
-    uint8_t     magic;           // identifier
-
-    size_t      blk_size;           // size of a single block
-    size_t      imap_size;          // quantity of inodes
-    size_t      dmap_size;          // quantity of blocks
-};
-
-struct fs_dev
-{
-    uint                    enabled :1;     // in use
-    uint                    port_no :3;     // serial port number
-    uint                            :4; 
-    inode_t                 inode;          // dir mounted
-    struct fs_superblock    superblock;     // block informations
-};
-
-/* list of devices */ 
-extern struct fs_dev devices[FS_MOUNT_LIMIT];
-
-#endif
diff --git a/sw/z80/kernel/include/fs/dirent.h b/sw/z80/kernel/include/fs/dirent.h
deleted file mode 100644
index 2fd224a..0000000
--- a/sw/z80/kernel/include/fs/dirent.h
+++ /dev/null
@@ -1,17 +0,0 @@
-#ifndef __DIRENT_H__
-#define __DIRENT_H__
-
-#include "types.h"
-
-struct dirent
-{
-    ino_t       inode;       // inode referred
-    uint8_t     name_size;    // size of the name
-    char        name[];         // name of the referred inode
-};
-
-/* if inode is FS_INO_NULL, then the dirent is a memory leak */
-/* Warning: dirent leaks are generated by rm or rmdir operations */
-/* Filesystem must be periodically checked and cleaned */
-
-#endif  // __DIRENT_H__
diff --git a/sw/z80/kernel/include/fs/fd.h b/sw/z80/kernel/include/fs/fd.h
deleted file mode 100644
index d2fea2a..0000000
--- a/sw/z80/kernel/include/fs/fd.h
+++ /dev/null
@@ -1,102 +0,0 @@
-#ifndef __FD_H__
-#define __FD_H__
-
-#include "types.h"
-
-#define FD_MAX 32
-
-#define OPEN_READ       0x1
-#define OPEN_WRITE      0x2 
-#define OPEN_BIN        0x4
-#define OPEN_APPEND     0x8
-#define OPEN_ERASE      0x10
-#define OPEN_DIR        0x20
-#define OPEN_LINK       0x40
-
-#define LS_ALL       0x1
-
-/* declare dirent, not include */
-#ifndef __DIRENT_H__
-struct dirent;
-#endif
-
-/* set of operations callback for fd */
-struct fd_operations
-{
-    size_t (*readline)(inode_t, fsize_t, char *, char term);
-    size_t (*print)(inode_t, fsize_t, const char *);
-    size_t (*append)(inode_t, fsize_t*, const char *);
-
-    size_t (*read)(inode_t, fsize_t, void *, size_t);
-    size_t (*write)(inode_t, fsize_t, const void *, size_t);
-    size_t (*bin_append)(inode_t, fsize_t*, const void *, size_t);
-
-    size_t (*ls)(inode_t, struct dirent *, uint8_t);
-    size_t (*find)(inode_t, struct dirent *, const char *);
-    int8_t (*mkdir)(inode_t, const char *);
-    int8_t (*rmdir)(inode_t, const char *);
-    int8_t (*touch)(inode_t, const char *);
-    int8_t (*rm)(inode_t, const char *);
-    int8_t (*ln)(inode_t, const char *, const char *);
-
-    int8_t (*special)(inode_t, void *, size_t);
-};
-
-/* file descriptor */
-struct file_desc
-{
-    inode_t                 inode;  // inode pointed
-    fsize_t                 seek;   // virtual seek
-    devsize_t               begin;  // beginning of blocks
-    struct fd_operations    opers;  // bound operations
-};
-
-/* bitmap of used file descriptors */
-extern struct uint8_t fd_bmap[FD_TABLE_SIZE / 8];
-
-/* table of file descriptors */
-extern struct file_desc fd_table[FD_TABLE_SIZE];
-
-/* returns a free file descriptor */
-int8_t __fd_new();
-
-/* opens a file streaming of the cwd */
-int8_t __open_c_inode(uint8_t flags);
-
-/* opens a file streaming by a path */
-int8_t open(const char *path, uint8_t flags); 
-
-/* list content of directory */
-size_t ls(int8_t fd, struct dirent *buf, uint8_t all);
-
-/* find name through the directory entries */
-size_t find(int8_t fd, struct dirent *buf, const char *name);
-
-/* creates a new directory inside fd with the specified name */
-int8_t mkdir(int8_t fd, const char *name);
-
-/* creates a new file inside fd with the specified name */
-int8_t touch(int8_t fd, const char *name);
-
-/* creates a new symlink inside fd with the specified name */
-int8_t ln(int8_t fd, const char *name);
-
-/* change virtual seek position of the fd */
-int8_t seek(int8_t fd, fsize_t pos);
-
-/* reads a string from the fd until the terminator is reached */
-size_t readline(int8_t fd, char *buf, char term);
-
-/* writes a string into the fd */
-int8_t print(int8_t fd, const char *str);
-
-/* reads n bytes from the fd */
-size_t read(int8_t fd, void *buf, size_t n);
-
-/* writes n bytes into the fd */
-int8_t write(int8_t fd, const void *buf, size_t n);
-
-/* frees fd space */
-void close(int8_t fd);
-
-#endif  // __FD_H__
diff --git a/sw/z80/kernel/include/fs/fdop.h b/sw/z80/kernel/include/fs/fdop.h
deleted file mode 100644
index d4b1b77..0000000
--- a/sw/z80/kernel/include/fs/fdop.h
+++ /dev/null
@@ -1,140 +0,0 @@
-#ifndef __FDOP_H__
-#define __FDOP_H__
-
-#include "types.h"
-
-#ifndef __DIRENT_H__
-struct dirent;
-#endif
-
-/* macro for direct binding */
-
-#define FD_BIND_AS_DIR(oper)    {       \
-                                    oper.ls = &as_ls;   \
-                                    oper.find = &as_find; \
-                                    oper.mkdir = &as_mkdir; \
-                                    oper.rmdir = &as_rmdir; \
-                                    oper.touch = &as_touch; \
-                                    oper.rm = &as_rm; \
-                                    oper.ln = &as_ln; \
-                                }
-
-#define FD_BIND_SS_DIR(oper)    {       \
-                                    oper.ls = &ss_ls;   \
-                                    oper.find = &ss_find; \
-                                    oper.mkdir = &ss_mkdir; \
-                                    oper.rmdir = &ss_rmdir; \
-                                    oper.touch = &ss_touch; \
-                                    oper.rm = &ss_rm; \
-                                    oper.ln = &ss_ln; \
-                                }
-
-#define FD_BIND_AS_FILE(opers, flags) {      \
-                                    if (flags & OPEN_READ)  \
-                                        opers.readline = as_readline;   \
-                                    if (flags & OPEN_APPEND)    \
-                                        opers.append = as_append;   \
-                                    else if (flags & OPEN_WRITE)    \
-                                        opers.print = as_print;     \
-                                    }
-
-#define FD_BIND_SS_FILE(opers, flags) {      \
-                                    if (flags & OPEN_READ)  \
-                                        opers.readline = ss_readline;   \
-                                    if (flags & OPEN_APPEND)    \
-                                        opers.append = ss_append;   \
-                                    else if (flags & OPEN_WRITE)    \
-                                        opers.print = ss_print;     \
-                                     }
-
-#define FD_BIND_AS_BINFILE(opers, flags) {     \
-                                        if (flags & OPEN_READ)  \
-                                            opers.read = as_read;   \
-                                        if (flags & OPEN_APPEND)    \
-                                            opers.bin_append = as_bin_append;   \
-                                        else if (flags & OPEN_WRITE)    \
-                                            opers.write = as_write;     \
-                                        }
-
-#define FD_BIND_SS_BINFILE(opers, flags) {     \
-                                        if (flags & OPEN_READ)  \
-                                            opers.read = ss_read;   \
-                                        if (flags & OPEN_APPEND)    \
-                                            opers.bin_append = ss_bin_append;   \
-                                        else if (flags & OPEN_WRITE)    \
-                                            opers.write = ss_write;     \
-                                        }
-
-/* Set of file descriptors operations */
-/* Determines if to use the serial interface or the address space */
-
-/* Address space section */
-
-/* File functions */
-
-size_t as_readline(inode_t inode, fsize_t seek, char *buf, char term);
-
-size_t as_print(inode_t inode, fsize_t seek, const char *str);
-
-size_t as_append(inode_t inode, fsize_t *seek_ptr, const char *str);
-
-
-size_t as_read(inode_t inode, fsize_t seek, void *buf, size_t n);
-
-size_t as_write(inode_t inode, fsize_t seek, const void *buf, size_t n);
-
-size_t as_bin_append(inode_t inode, fsize_t *seek_ptr, const void *buf, size_t
-n);
-
-/* Directory functions */
-
-size_t as_ls(inode_t inode, struct dirent *buf, uint8_t all);
-
-size_t as_find(inode_t inode, struct dirent *buf, const char *name);
-
-int8_t as_mkdir(inode_t inode, const char *name);
-
-int8_t as_rmdir(inode_t inode, const char *name);
-
-int8_t as_touch(inode_t inode, const char *name);
-
-int8_t as_rm(inode_t inode, const char *name);
-
-int8_t as_ln(inode_t inode, const char *path, const char *name);
-
-/* Serial Space section */
-/* Warning, it doesn't switch to the right driver */
-
-/* File functions */
-
-size_t ss_readline(inode_t inode, fsize_t seek, char *buf, char term);
-
-size_t ss_print(inode_t inode, fsize_t seek, const char *str);
-
-size_t ss_append(inode_t inode, fsize_t *seek_ptr, const char *str);
-
-
-size_t ss_read(inode_t inode, fsize_t seek, void *buf, size_t n);
-
-size_t ss_write(inode_t inode, fsize_t seek, const void *buf, size_t n);
-
-size_t ss_bin_append(inode_t inode, fsize_t *seek_ptr, const void *buf, size_t
-n);
-
-/* Directory functions */
-
-size_t ss_ls(inode_t inode, struct dirent *buf, uint8_t all);
-
-size_t ss_find(inode_t inode, struct dirent *buf, const char *name);
-
-int8_t ss_mkdir(inode_t inode, const char *name);
-
-int8_t ss_rmdir(inode_t inode, const char *name);
-
-int8_t ss_touch(inode_t inode, const char *name);
-
-int8_t ss_rm(inode_t inode, const char *name);
-
-int8_t ss_ln(inode_t, const char *path, const char *name);
-
-#endif // __FDOP_H__
diff --git a/sw/z80/kernel/include/fs/fs.h b/sw/z80/kernel/include/fs/fs.h
deleted file mode 100644
index ad20adb..0000000
--- a/sw/z80/kernel/include/fs/fs.h
+++ /dev/null
@@ -1,63 +0,0 @@
-#ifndef __FS_H__
-#define __FS_H__
-
-#include "types.h"
-
-#define FS_OFFSET 0x1000
-
-#define FS_BLOCKS_SIZE 512
-#define FS_BLOCKS_N     8
-#define FS_BLOCKS_IND   6
-
-#define INODE_TYPE_FILE   0x0
-#define INODE_TYPE_DIR    0x1
-#define INODE_TYPE_SLINK    0x2
-#define INODE_TYPE_SPECIAL  0x3
-
-#define INODE_META_SIZE 8
-
-/* inode basic structure */
-struct fs_inode
-{
-    /* inode meta data */
-
-    uint        mode :3;  // chmod
-    uint        uid :3;   // chown
-    uint        type :2;  // file, dir, sym-link, special
-
-    time_t      ctime;          // creation time
-
-    uint24_t     size;              // inode size
-
-    /* data storage informations */
-    /* it doesn't allocate memory, virtual size FS_BLOCKS_N */ 
-    blk_t     blocks[];
-};
-
-#define FS_DEV_ROM      0x7f    /* 01111111 */
-#define FS_DEV_NULL     0x80    /* 10000000 */
-
-#define FS_ROM_SPACE    0x2000  // second rom 
-
-#define FS_INO_ROOT   0x0       // first inode
-
-#define FS_INODE_ROOT(inode)   {inode.dev = 0xff; inode.inode = 0x0}
-#define FS_INODE_NULL(inode)   {inode.dev = 0x80; inode.inode = 0x0}
-
-#define FS_USE_ROM(inode)   {inode.dev == 0x7f}
-
-/* get block seek in current device */
-devsize_t fs_block(blk_t block);
-
-/* get common inode seek in current device */
-/* c_inode must be set first */
-/* returns seek at the beginning of blocks field */
-devsize_t fs_inode(struct fs_inode *buf);
-
-/* common inode for syscalls */
-extern inode_t c_inode;
-
-/* parse a path, absolute or relative to c_inode */
-inode_t fs_parse_path(const char *path);
-
-#endif  // __FS_H__
diff --git a/sw/z80/kernel/include/fs/iter.h b/sw/z80/kernel/include/fs/iter.h
deleted file mode 100644
index 41f011d..0000000
--- a/sw/z80/kernel/include/fs/iter.h
+++ /dev/null
@@ -1,17 +0,0 @@
-#ifndef __ITER_H__
-#define __ITER_H__
-
-struct inode_iter
-{
-    devsize_t   dev_seek;       /* seek position in the volume */
-    devsize_t   blk_end;        /* end of the block */
-
-    int16_t     blk_index;      /* index of the block */
-
-    int8_t      blk_level;      /* recursion level, indirect blocks */
-    
-    fsize_t     fseek;          /* virtual seek in the file */
-    fsize_t     size;           /* file size */
-};
-
-#endif  // __ITER_H__
diff --git a/sw/z80/kernel/include/fs/users.h b/sw/z80/kernel/include/fs/users.h
deleted file mode 100644
index 83980e5..0000000
--- a/sw/z80/kernel/include/fs/users.h
+++ /dev/null
@@ -1,21 +0,0 @@
-#ifndef USERS_H
-#define USERS_H
-
-#include "types.h"
-
-#define USERS_MAX   8
-#define USER_ROOT   0 
-
-/* current user in use */
-extern struct fs_user c_user;
-
-struct fs_user
-{
-    char        name[32];
-    ino_t       home;
-    uint8_t     perm;       // TODO, permissions 
-};
-
-/* all users are in rom device */
-
-#endif
diff --git a/sw/z80/kernel/include/memory.h b/sw/z80/kernel/include/memory.h
deleted file mode 100644
index 67c4b88..0000000
--- a/sw/z80/kernel/include/memory.h
+++ /dev/null
@@ -1,50 +0,0 @@
-#ifndef __MEMORY_H__
-#define __MEMORY_H__
-
-#include "types.h"
-#include "devices.h"
-
-/* maximum number of pages on the system */
-#define PAGES_MAX_COUNT 32
-#define PAGE_SIZE     1000
-
-/* in our system there are only 16 pages since only 64KB can be addressed
- * to optimize the memory management in ROM and RAM only pages from this set
- * shall be used
- */
-// ROM
-#define ADDR_PAGE_0  0x0000
-#define ADDR_PAGE_1  0x1000
-#define ADDR_PAGE_2  0x2000
-#define ADDR_PAGE_3  0x3000
-// IOSPACE
-#define ADDR_PAGE_4  0x4000
-#define ADDR_PAGE_5  0x5000
-#define ADDR_PAGE_6  0x6000
-#define ADDR_PAGE_7  0x7000
-// RAM
-#define ADDR_PAGE_8  0x8000
-#define ADDR_PAGE_9  0x9000
-#define ADDR_PAGE_10 0xA000
-#define ADDR_PAGE_11 0xB000
-#define ADDR_PAGE_12 0xC000
-#define ADDR_PAGE_13 0xD000
-#define ADDR_PAGE_14 0xE000
-#define ADDR_PAGE_15 0xF000
-
-#define ADDR_PAGE_FIRST  ADDR_PAGE_8
-#define ADDR_PAGE_LAST   ADDR_PAGE_15
-
-struct page
-{
-	pid_t pid;       // process owner of the page (0 if free)
-    uint16_t addr;   // physical address
-};
-
-int mmu_write_table(void);
-
-int page_new(void);
-int page_map(int page, int pid, uint16_t addr);
-int page_unmap(int page);
-
-#endif // __MEMORY_H__
diff --git a/sw/z80/kernel/include/process.h b/sw/z80/kernel/include/process.h
deleted file mode 100644
index 3b0c843..0000000
--- a/sw/z80/kernel/include/process.h
+++ /dev/null
@@ -1,43 +0,0 @@
-#ifndef __PROCESS_H__
-#define __PROCESS_H__
-
-#include "types.h"
-#include "memory.h"
-
- /* maximum number of processes (i.e. pages in ram)
-  * since each program can use only one page in ram
-  */
-#define PROC_COUNT 2 
-
-/* the pid is defined with a single byte (pid_t is uint8_t), because of that 
- * there cannot be more than 255 processes open at the same time. this is a
- * limitation but for our purposes is more than enough
- */
-#define PID_COUNT_MAX 255
-
-struct executable
-{
-    void *text;
-    size_t text_size;
-    void *bss;
-    size_t bss_size;
-};
-
-struct process
-{
-    uint blocked :1;      // process is waiting for hardware or locked
-    uint running :1;      // pid is used
-    uint pages;           // number of pages used by the process
-    struct page page[4];  // pages used by the process
-};
-
-pid_t newpid(void);
-
-int fork(void);
-int exec(char *path, char *args);
-int spawn(char *path, char *args);
-
-pid_t getpid(void);
-int kill(pid_t pid);
-
-#endif // __PROCESS_H__
diff --git a/sw/z80/kernel/include/sio.h b/sw/z80/kernel/include/sio.h
deleted file mode 100644
index 276b99c..0000000
--- a/sw/z80/kernel/include/sio.h
+++ /dev/null
@@ -1,43 +0,0 @@
-#ifndef __SIO_H__
-#define __SIO_H__
-
-#include "types.h"
-
-#define SIO_PORT_0 0x0
-#define SIO_PORT_1 0x1
-#define SIO_PORT_2 0x2
-#define SIO_PORT_3 0x3
-#define SIO_PORT_4 0x4
-#define SIO_PORT_5 0x5
-#define SIO_PORT_6 0x6
-#define SIO_PORT_7 0x7
-
-/* current port in use */
-extern uint8_t      sio_port;
-
-/* current seek in the device */
-extern devsize_t    sio_seek;
-
-struct dev_buffer
-{
-   // TODO, bytes needed to the device buffer interface
-};
-
-/* points to the buffers mapped in the I/O space */
-/* to be defined precisely in assembly */
-extern volatile struct dev_buffer sio_buffers[8];
-
-/* initialize serial interface */
-void sio_init();
-
-/* syscall: read one byte from the current device */
-uint8_t sio_recv();
-/* syscall: write one byte into the current device */
-void sio_send(uint8_t value);
-
-/* read n bytes from the current port */
-size_t sio_read(void *buffer, size_t n);
-/* write n bytes into the current port */
-int8_t sio_write(const void *buffer, size_t n);
-
-#endif  // __SIO_H__
diff --git a/sw/z80/kernel/include/stat.h b/sw/z80/kernel/include/stat.h
deleted file mode 100644
index 44c0f63..0000000
--- a/sw/z80/kernel/include/stat.h
+++ /dev/null
@@ -1,24 +0,0 @@
-#ifndef __STAT_H__
-#define __STAT_H__
-
-#include "types.h"
-
-struct stat
-{
-    inode_t     inode;      /* inode reference */
-
-    uint        mode :3;    /* mode */
-    uint        uid :3;     /* owner id */
-    uint        type :2;    /* file, dir or link */
-
-    devsize_t   size;       /* file size */
-
-    size_t      blk_size;   /* single block size */
-    size_t      blk_used;   /* blocks used by the file */
-
-    time_t      ctime;      /* creation time */
-}
-
-struct stat * stat(const char *path, struct stat *buffer);
-
-#endif  // __STAT_H__
diff --git a/sw/z80/kernel/include/types.h b/sw/z80/kernel/include/types.h
deleted file mode 100644
index c6e620b..0000000
--- a/sw/z80/kernel/include/types.h
+++ /dev/null
@@ -1,62 +0,0 @@
-#ifndef __TYPES_H__
-#define __TYPES_H__
-
-/* only types from primitive types are defined in this file */ 
-
-typedef volatile unsigned char      register_t;
-
-typedef unsigned int                uint;
-
-typedef char                        int8_t;
-typedef unsigned char               uint8_t;
-typedef int                         int16_t;
-typedef unsigned int                uint16_t;
-typedef long int                    int32_t;
-typedef unsigned long int           uint32_t;
-
-typedef uint16_t                    size_t;
-typedef int16_t                     ssize_t;
-
-typedef uint8_t                     pid_t;
-typedef uint16_t                    ino_t;
-
-typedef uint8_t                     dev_t;
-typedef uint32_t                    devsize_t;
-typedef uint8_t                     fd_t;
-typedef uint16_t                    blk_t;
-typedef uint8_t                     user_t;
-
-typedef struct {
-    uint8_t member[3];
-
-} uint24_t;
-
-typedef uint32_t                    fsize_t;
-
-typedef struct 
-{
-    dev_t   dev;    // device id, global in the fs
-    ino_t   inode;    // inode id relative to the volume
-
-} inode_t;
-
-typedef struct time_s
-{
-    struct
-    {
-        uint    minutes :6;
-        uint    hour    :5;
-
-    } time;
-
-    struct
-    {
-        uint    day     :5;
-        uint    month   :4;
-        uint    year    :12;
-
-    } date;
-
-} time_t;
-
-#endif
diff --git a/sw/z80/kernel/kernel.c b/sw/z80/kernel/kernel.c
deleted file mode 100644
index 3d5aeb6..0000000
--- a/sw/z80/kernel/kernel.c
+++ /dev/null
@@ -1,7 +0,0 @@
-#include "types.h"
-#include "usart.h"
-
-void kmain(void)
-{
-    usart_init(USART_BAUDRATE_9600, USART_PARITY_EVEN, USART_STOP_BITS_1);
-}
diff --git a/sw/z80/kernel/makefile b/sw/z80/kernel/makefile
deleted file mode 100644
index be8eed4..0000000
--- a/sw/z80/kernel/makefile
+++ /dev/null
@@ -1,53 +0,0 @@
-####
-# source code settings
-#
-OSNAME := helvetiOS
- 
-CSOURCES 	:=  $(wildcard *.c) \
-				$(wildcard drivers/*.c)
-
-OBJECTS 	:= $(patsubst %.c,build/%.rel,$(CSOURCES))
-HEXFILE		:= build/$(OSNAME).hex
-BINARY  	:= build/$(OSNAME).bin
-
-### 
-# compiler settings
-
-CC 		:= sdcc
-
-CFLAGS	:= -mz80 \
-			-I include \
-			-I include/drivers \
-			-I libc/include \
-			--opt-code-size \
-			-DDEBUG
-
-LDFLAGS := -mz80 --no-std-crt0 build/crt0.rel \
-			--std-c89 -pedantic \
-			--code-loc 0x0800 --data-loc 0x8000
-
-.PHONY: dirs dis clean
-all: $(BINARY)
-
-# build binary
-$(BINARY): $(OBJECTS) dirs
-	$(CC) $(LDFLAGS) $(OBJECTS) -o $(HEXFILE)
-	makebin -s 16384 $(HEXFILE) $(BINARY)
-
-$(OBJECTS): build/%.rel : %.c $(CSOURCES) dirs build/crt0.rel
-	@printf "\n"
-	$(CC) $(CFLAGS) -c $< -o $@
-
-build/crt0.rel: crt0.s
-	sdasz80 -o $<
-	@mv crt0.rel build
-
-dirs:
-	mkdir -p build build/kernel build/libc build/kernel/drivers
-
-dis: $(BINARY)
-	dz80 -b -n $<
-
-clean:
-	- rm -rd build/*
-	- rm crt0.rel
diff --git a/sw/z80/kernel/memory.c b/sw/z80/kernel/memory.c
deleted file mode 100644
index 1b2cc76..0000000
--- a/sw/z80/kernel/memory.c
+++ /dev/null
@@ -1,94 +0,0 @@
-#include "memory.h"
-
-static struct page pages_table[PAGES_MAX_COUNT];
-
-int mmu_write_table(void)
-{
-    int i;
-
-    for (i = 0; i < PAGES_MAX_COUNT; i++) {
-        if (pages_table[i].pid != 0) {
-            // write to mmu table
-        }
-    }
-
-    return 0;
-}
-
-int page_new(void)
-{
-    int i, used;
-    uint16_t addr;
-
-    for (addr = ADDR_PAGE_FIRST; addr < ADDR_PAGE_LAST; addr += PAGE_SIZE) {
-        used = 0;
-
-        for (i = 0; i < PAGES_MAX_COUNT; i++) {
-            if (pages_table[i].addr == addr) {
-                used = 1;
-                break;
-            }
-        }
-
-        if (!used)
-            return i;
-    }
-
-    return -1;
-}
-
-int page_map(int page, int pid, uint16_t addr)
-{
-    if (page >= PAGES_MAX_COUNT)
-        return -1;
-
-    if (pages_table[page].pid != 0)
-        return -2;
-
-    pages_table[page].addr = addr;
-    pages_table[page].pid = pid;
-
-    return 0;
-}
-
-int page_unmap(int page)
-{
-    if (page >= PAGES_MAX_COUNT)
-        return -1;
-
-    if (pages_table[page].pid == 0)
-        return -2;
-
-    pages_table[page].pid = 0;
-    pages_table[page].addr = 0;
-    return 0;
-}
-
-/* k_malloc manager */
-/*
-struct k_buf_entry k_buf_table[K_BUF_MAX_COUNT];
-
-struct k_buf k_buffers[K_BUF_MAX_COUNT];
-
-void * k_malloc()
-{
-    for (uint8_t i = 0; i < K_BUF_TABLE_COUNT; i++)
-    {
-        for (uint8_t bit = 0x80, j = 0; j < 8; bit >>= 1, j++)
-        {
-            if (bit & k_buf_table[i])
-            {
-                k_buf_table[i] |= bit;
-                return &k_buffers[8 * i + j];
-            }
-        }
-    }
-}
-
-void k_free(void * ptr)
-{
-    uint8_t index = (ptr - &k_buffers[0]) / K_BUF_SIZE;
-
-    if (index < K_BUF_MAX_COUNT)
-        k_buf_table[index / 8] ^= 0x80 >> index % 8;
-}*/
diff --git a/sw/z80/kernel/process.c b/sw/z80/kernel/process.c
deleted file mode 100644
index 7d8db89..0000000
--- a/sw/z80/kernel/process.c
+++ /dev/null
@@ -1,58 +0,0 @@
-#include "process.h"
-
-static struct process proc_table[PID_COUNT_MAX];
-static struct process *current_proc;
-
-pid_t newpid(void)
-{
-    int i;
-    static pid_t last_pid = 0;
-
-    for (i = 0; i < PID_COUNT_MAX; i++, last_pid++) {
-        if (last_pid == PID_COUNT_MAX) {
-            last_pid = 0;
-            continue;            
-        }
-
-        if (!proc_table[last_pid].running)
-            break;
-    }
-
-    if (i >= PID_COUNT_MAX)
-        return 0;
-
-    return last_pid;
-}
-
-int fork(void)
-{
-    int i, p;
-    pid_t child_pid = newpid();
-
-    if (child_pid == 0)
-        return -1;
-
-
-    for (i = 0; i < current_proc->pages; i++) {
-        p = page_new();
-
-        if (p == -1) {
-            return -2;
-        }
-
-        // TODO: use memcpy()
-        // SDCC does not allow assignemnts of structs
-
-        // proc_table[child_pid].page[i] = p;
-    }
-}
-
-int exec(char *path, char *args)
-{
-    
-}
-
-int spawn(char *path, char *args)
-{
-    
-}
diff --git a/sw/z80/libc/include/stdint.h b/sw/z80/libc/include/stdint.h
deleted file mode 100644
index 5e8caf3..0000000
--- a/sw/z80/libc/include/stdint.h
+++ /dev/null
@@ -1,13 +0,0 @@
-#ifndef __STDINT_H__
-#define __STDINT_H__
-
-typedef unsigned int                uint;
-
-typedef char                        int8_t;
-typedef unsigned char               uint8_t;
-typedef int                         int16_t;
-typedef unsigned int                uint16_t;
-typedef long int                    int32_t;
-typedef unsigned long int           uint32_t;
-
-#endif // __STDINT_H__
\ No newline at end of file
diff --git a/sw/z80/libc/include/stdio.h b/sw/z80/libc/include/stdio.h
deleted file mode 100644
index b31cdfd..0000000
--- a/sw/z80/libc/include/stdio.h
+++ /dev/null
@@ -1,11 +0,0 @@
-#ifndef __STDIO_H__
-#define __STDIO_H__
-
-#include "types.h"
-
-extern uint8_t *stdout, stderr;
-
-void putc(char ch, uint8_t *buffer);
-int printf(const char *fmt, ...);
-
-#endif 
diff --git a/sw/z80/libc/include/stdlib.h b/sw/z80/libc/include/stdlib.h
deleted file mode 100644
index c69f573..0000000
--- a/sw/z80/libc/include/stdlib.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef __STDLIB_H__
-#define __STDLIB_H__
-
-#include "stdint.h"
-
-
-#endif // __STDLIB_H__
\ No newline at end of file
diff --git a/sw/z80/libc/include/string.h b/sw/z80/libc/include/string.h
deleted file mode 100644
index 9c002e3..0000000
--- a/sw/z80/libc/include/string.h
+++ /dev/null
@@ -1,12 +0,0 @@
-#ifndef __STRING_H__
-#define __STRING_H__
-
-#include "types.h"
-
-void * memset(void *dest, const int8_t src, size_t n);
-
-void *memcpy(void *dest, const void *src, size_t n);
-
-int8_t memcmp(const void *s1, const void *s2, size_t n);
-
-#endif
diff --git a/sw/z80/libc/include/sysio.h b/sw/z80/libc/include/sysio.h
deleted file mode 100644
index 5d1f5ae..0000000
--- a/sw/z80/libc/include/sysio.h
+++ /dev/null
@@ -1,55 +0,0 @@
-#ifndef __SYSIO_H__
-#define __SYSIO_H__
-
-#include "types.h"
-
-/*
-* 	Memory management
-*/
-
-void * malloc(uint16_t size);
-uint16_t malloc_size(void * address);
-void free(void * address);
-
-/*
-*	File management
-*/
-
-#define F_WRITE "w"
-#define F_READ "r"
-#define F_BIN_WRITE "wb"
-#define F_BIN_READ "rb"
-
-#define F_READ_CODE 0x0
-#define F_WRITE_CODE 0x1
-#define F_BIN_READ_CODE 0x2
-#define F_BIN_WRITE_CODE 0x3
-
-#define F_PERM_READ 0x0
-#define F_PERM_WRITE 0x1
-#define F_PERM_RW 0x2
-
-struct file {
-
-	const char * path;
-	unsigned int mode:4;
-	unsigned int permission:4;
-};
-
-#define FILE struct file
-
-FILE * fopen(const char * path, const char * mode);
-uint8_t fclose(FILE * file);
-
-// TODO: other functions
-
-/*
-*	Processes management
-*/
-
-#define PID uint16_t
-
-void exit();	// exit this program
-void interrupt(PID)
-
-#endif
\ No newline at end of file
diff --git a/sw/z80/libc/include/types.h b/sw/z80/libc/include/types.h
deleted file mode 100644
index a083bfe..0000000
--- a/sw/z80/libc/include/types.h
+++ /dev/null
@@ -1,60 +0,0 @@
-#ifndef __TYPES_H__
-#define __TYPES_H__
-
-/* only types from primitive types are defined in this file */ 
-
-typedef volatile unsigned char      register_t;
-
-typedef unsigned int                uint;
-
-typedef char                        int8_t;
-typedef unsigned char               uint8_t;
-typedef int                         int16_t;
-typedef unsigned int                uint16_t;
-typedef long int                    int32_t;
-typedef unsigned long int           uint32_t;
-
-typedef uint16_t                    size_t;
-typedef int16_t                     ssize_t;
-
-typedef uint8_t                     pid_t;
-typedef uint16_t                    ino_t;
-
-typedef uint8_t                     dev_t;
-typedef uint32_t                    devsize_t;
-typedef uint8_t                     fd_t;
-typedef uint16_t                    blk_t;
-typedef uint8_t                     user_t; 
-typedef struct {
-    uint8_t member[3];
-} uint24_t;
-
-typedef uint32_t                    fsize_t;
-
-typedef struct 
-{
-    dev_t   dev;    // device id, global in the fs
-    ino_t   inode;    // inode id relative to the volume
-
-} inode_t;
-
-typedef struct time_s
-{
-    struct
-    {
-        uint    minutes :6;
-        uint    hour    :5;
-
-    } time;
-
-    struct
-    {
-        uint    day     :5;
-        uint    month   :4;
-        uint    year    :12;
-
-    } date;
-
-} time_t;
-
-#endif
diff --git a/sw/z80/libc/stdio.c b/sw/z80/libc/stdio.c
deleted file mode 100644
index c2548d6..0000000
--- a/sw/z80/libc/stdio.c
+++ /dev/null
@@ -1,12 +0,0 @@
-#include "stdio.h"
-
-void putc(char ch, uint8_t *buffer)
-{
-    *buffer = ch;
-    *(++buffer) = '\0';
-}
-
-
-int printf(const char *fmt, ...)
-{
-}
diff --git a/sw/z80/libc/string.c b/sw/z80/libc/string.c
deleted file mode 100644
index 57b3a7f..0000000
--- a/sw/z80/libc/string.c
+++ /dev/null
@@ -1,37 +0,0 @@
-#include "string.h"
-
-void *memset(void *dest, const int8_t src, size_t n) {
-
-    char *dp = (char *) dest;
-
-    while (n--)
-        *(dp++) = src;
-
-    return dest;
-}
-
-void *memcpy(void *dest, void *src, size_t n)
-{
-    char *dp = dest;
-    char *sp = src;
-
-    while (n--) {
-        *dp++ = *sp++;
-    }
-
-    return dest;
-}
-
-int8_t memcmp(void *s1, void *s2, size_t n)
-{
-    char *u1 = (char *) s1;
-    char *u2 = (char *) s2;
-
-    for ( ; n--; u1++, u2++) {
-
-        if (*u1 != *u2)
-            return u1 - u2;
-    }
-
-    return 0;
-}
\ No newline at end of file
diff --git a/sw/z80/tests/asm/main.s b/sw/z80/tests/asm/main.s
deleted file mode 100644
index 8cf4df0..0000000
--- a/sw/z80/tests/asm/main.s
+++ /dev/null
@@ -1,40 +0,0 @@
-    .module crt0
-    .area   _HEADER (ABS)
-
-;; Reset vectors
-    .org    0
-    jp  init
-
-    .org    0x38 ; the instruction 0xff (not written) resets to this location
-    jp init
-
-;; main code
-    .org    0x100
-    .globl  _main
-
-init:
-    ;; Set stack pointer directly above top of memory.
-    ld  sp,#0xffff
-
-    ;; Start of the program
-    call    _main
-    jp      _exit
-
-_exit:
-    halt
-    ; jp  _exit
-
-;; Ordering of segments for the linker.
-    .area   _HOME
-    .area   _CODE
-_main:
-    ret
-    .area   _INITIALIZER
-    .area   _GSINIT
-    .area   _GSFINAL
-
-    .area   _DATA
-    .area   _INITIALIZED
-    .area   _BSEG
-    .area   _BSS
-    .area   _HEAP
diff --git a/sw/z80/tests/asm/makefile b/sw/z80/tests/asm/makefile
deleted file mode 100644
index 413b0fe..0000000
--- a/sw/z80/tests/asm/makefile
+++ /dev/null
@@ -1,47 +0,0 @@
-####
-# source code settings
-#
-OSNAME := ram_test
- 
-CSOURCES 	:=  $(wildcard *.s)
-
-OBJECTS 	:= $(patsubst %.s,build/%.rel,$(SOURCES))
-HEXFILE		:= build/$(OSNAME).hex
-BINARY  	:= build/$(OSNAME).bin
-
-### 
-# compiler settings
-#
-ASM		:= sdasz80
-LD		:= sdldz80
-
-FLAGS	:= 
-LDFLAGS :=
-
-.PHONY: flash dirs dis clean
-all: $(BINARY)
-
-flash: $(BINARY)
-	minipro -p M28C64 -w $< 
-
-# build binary
-$(BINARY): $(OBJECTS) dirs
-	$(LD) $(LDFLAGS) $(OBJECTS) -o $(HEXFILE)
-	makebin -s 8192 -yo 1 $(HEXFILE) $(BINARY)
-
-$(OBJECTS): build/%.rel : %.s $(SOURCES) dirs
-	@printf "\n"
-	$(ASM) $(FLAGS) $< -o
-
-build/crt0.rel: crt0.s
-	sdasz80 -o $<
-	@mv crt0.rel build/
-
-dirs:
-	mkdir -p build
-
-dis: $(BINARY)
-	r2 -a z80 $< -c 'pd 0x10; s 0x100; pd 10; s 0x200; pd 10'
-
-clean:
-	- rm -rd build
diff --git a/sw/z80/tests/pio/crt0.s b/sw/z80/tests/pio/crt0.s
deleted file mode 100644
index c900065..0000000
--- a/sw/z80/tests/pio/crt0.s
+++ /dev/null
@@ -1,38 +0,0 @@
-    .module crt0
-    .area   _HEADER (ABS)
-
-;; Reset vectors
-    .org    0
-    jp  init
-
-    .org    0x38 ; the instruction 0xff (not written) resets to this location
-    jp init
-
-;; main code
-    .org    0x100
-    .globl  _main
-
-init:
-    ;; Set stack pointer directly above top of memory.
-    ld  sp,#0xffff
-
-    ;; Start of the program
-    call    _main
-    jp      _exit
-
-_exit:
-    halt
-    ; jp  _exit
-
-;; Ordering of segments for the linker.
-    .area   _HOME
-    .area   _CODE
-    .area   _INITIALIZER
-    .area   _GSINIT
-    .area   _GSFINAL
-
-    .area   _DATA
-    .area   _INITIALIZED
-    .area   _BSEG
-    .area   _BSS
-    .area   _HEAP
diff --git a/sw/z80/tests/pio/main.c b/sw/z80/tests/pio/main.c
deleted file mode 100644
index 7ac64bc..0000000
--- a/sw/z80/tests/pio/main.c
+++ /dev/null
@@ -1,50 +0,0 @@
-// #include "pio.h"
-
-#include <stdint.h>
-
-#define PIO_A_DATA  0x10
-#define PIO_B_DATA  0x11
-#define PIO_A_CMD   0x12
-#define PIO_B_CMD   0x13
-
-void main(void)
-{
-    __asm
-    ;; output variable
-    ld h, #0x00
-
-    ;; set bit mode
-    ld c, #PIO_B_CMD
-
-    ld a, #0xCF
-    out (c), a
-
-    ;; set all pins to output
-    ld a, #0x00
-    out (c), a
-
-    ;; disable interrupts
-    ld a, #0x0C
-    out (c), a
-
-    ;; load data addr
-    ld c, #PIO_B_DATA
-loop:
-    out (c), h
-    ld a, h
-
-    cpl
-    ld h, a
-    jr loop
-    __endasm; 
-
-    // uint8_t i = 0;
-
-    // pio_set_mode(PIO_A, PIO_MODE_BIT_IO, 0x00);
-    // pio_set_interrupts(PIO_A, PIO_INT_DISABLE);
-
-    // while (1) {
-    //     pio_write(PIO_A, i);
-    //     i = ~i;
-    // }
-}
\ No newline at end of file
diff --git a/sw/z80/tests/pio/makefile b/sw/z80/tests/pio/makefile
deleted file mode 100644
index 1213902..0000000
--- a/sw/z80/tests/pio/makefile
+++ /dev/null
@@ -1,72 +0,0 @@
-####
-# source code settings
-#
-OSNAME := pio_test
- 
-CSOURCES 	:=  $(wildcard *.c)
-LIBS 		:= ../../arch/build/arch.a \
-			   ../../drivers/build/drivers.a
-
-OBJECTS 	:= $(patsubst %.c,build/%.rel,$(CSOURCES))
-HEXFILE		:= build/$(OSNAME).hex
-BINARY  	:= build/$(OSNAME).bin
-
-### 
-# compiler settings
-#
-CC 		:= sdcc
-
-CFLAGS	:= -mz80 \
-			--no-std-crt0 build/crt0.rel \
-			--allow-unsafe-read \
-			-I . \
-			-I ../../arch/include \
-			-I ../../drivers/include \
-			-DDEBUG
-
-LDFLAGS := -mz80 \
-			--no-std-crt0 build/crt0.rel \
-			-L ../../drivers/build \
-			-l drivers.a \
-			-pedantic \
-			--code-loc 0x0200
-			# --data-loc 0x2000
-
-.PHONY: flash dirs dis clean
-all: $(BINARY)
-
-flash: $(BINARY)
-	minipro -p M28C64 -w $< 
-
-# build binary
-$(BINARY): $(OBJECTS) dirs
-	$(CC) $(LDFLAGS) $(OBJECTS) -o $(HEXFILE)
-	makebin -s 8192 -yo 1 $(HEXFILE) $(BINARY)
-
-$(OBJECTS): build/%.rel : %.c $(CSOURCES) dirs build/crt0.rel $(LIBS)
-	@printf "\n"
-	$(CC) $(CFLAGS) -c $< -o $@
-
-$(LIBS): %.a:
-	@printf "\n"
-	make -C $(shell printf $@ | sed 's:build.*.::')
-
-build/crt0.rel: crt0.s
-	sdasz80 -o $<
-	@mv crt0.rel build/
-
-dirs:
-	mkdir -p build
-
-dis: $(BINARY)
-	dz80 -b -n -t $(BINARY)
-	r2 -a z80 $< \
-	-c 'afn main 0x200; \
-		pd 0x10; \
-		s 0x100; \
-		pd 10; \
-		s 0x200; \
-		pd 0x95' | tee build/dis.txt
-
-clean:
-	- rm -rd build
diff --git a/sw/z80/tests/ram/crt0.s b/sw/z80/tests/ram/crt0.s
deleted file mode 100644
index b0caa8c..0000000
--- a/sw/z80/tests/ram/crt0.s
+++ /dev/null
@@ -1,40 +0,0 @@
-	.module crt0
-	.area	_HEADER (ABS)
-
-;; Reset vectors
-	.org 	0
-	jp	init
-
-	.org	0x38 ; the instruction 0xff (not written) resets to this location
-    jp init
-
-;; main code
-	.org	0x100
-    .globl  _main
-
-init:
-	;; Set stack pointer directly above top of memory.
-	ld	sp,#0xffff
-
-	;; Start of the program
-	call	_main
-	jp	    _exit
-
-_exit:
-    halt
-    jp  _exit
-
-;; Ordering of segments for the linker.
-	.area	_HOME
-	.area	_CODE
-	.area	_INITIALIZER
-	.area   _GSINIT
-	.area   _GSFINAL
-
-	.area	_DATA
-	.area	_INITIALIZED
-	.area	_BSEG
-	.area   _BSS
-	.area   _HEAP
-
-	.area   _CODE
\ No newline at end of file
diff --git a/sw/z80/tests/ram/main.c b/sw/z80/tests/ram/main.c
deleted file mode 100644
index 581072b..0000000
--- a/sw/z80/tests/ram/main.c
+++ /dev/null
@@ -1,13 +0,0 @@
-
-void main(void)
-{
-    unsigned char j;
-    unsigned char *mem;
-    
-    j = 0;
-    mem = (unsigned char *) 0x8200; // somwhere in ram
-
-    while (1) {
-        *mem = j++;
-    }
-}
diff --git a/sw/z80/tests/ram/makefile b/sw/z80/tests/ram/makefile
deleted file mode 100644
index f8eb9fc..0000000
--- a/sw/z80/tests/ram/makefile
+++ /dev/null
@@ -1,54 +0,0 @@
-####
-# source code settings
-#
-OSNAME := ram_test
- 
-CSOURCES 	:=  $(wildcard *.c)
-
-OBJECTS 	:= $(patsubst %.c,build/%.rel,$(CSOURCES))
-HEXFILE		:= build/$(OSNAME).hex
-BINARY  	:= build/$(OSNAME).bin
-
-### 
-# compiler settings
-#
-CC 		:= sdcc
-
-CFLAGS	:= -mz80 \
-			-I . \
-			-DDEBUG
-
-LDFLAGS := -mz80 \
-			--no-std-crt0 build/crt0.rel \
-			-pedantic 
-
-			# --code-loc 0x0120 \
-			# --data-loc 0x2000
-
-.PHONY: flash dirs dis clean
-all: $(BINARY)
-
-flash: $(BINARY)
-	minipro -p M28C64 -w $< 
-
-# build binary
-$(BINARY): $(OBJECTS) dirs
-	$(CC) $(LDFLAGS) $(OBJECTS) -o $(HEXFILE)
-	makebin -s 8192 -yo 1 $(HEXFILE) $(BINARY)
-
-$(OBJECTS): build/%.rel : %.c $(CSOURCES) dirs build/crt0.rel
-	@printf "\n"
-	$(CC) $(CFLAGS) -c $< -o $@
-
-build/crt0.rel: crt0.s
-	sdasz80 -o $<
-	@mv crt0.rel build/
-
-dirs:
-	mkdir -p build
-
-dis: $(BINARY)
-	r2 -a z80 $< -c 'pd 0x10; s 0x100; pd 10; s 0x200; pd 10'
-
-clean:
-	- rm -rd build
diff --git a/sw/z80/tests/usart/crt0.s b/sw/z80/tests/usart/crt0.s
deleted file mode 100644
index c900065..0000000
--- a/sw/z80/tests/usart/crt0.s
+++ /dev/null
@@ -1,38 +0,0 @@
-    .module crt0
-    .area   _HEADER (ABS)
-
-;; Reset vectors
-    .org    0
-    jp  init
-
-    .org    0x38 ; the instruction 0xff (not written) resets to this location
-    jp init
-
-;; main code
-    .org    0x100
-    .globl  _main
-
-init:
-    ;; Set stack pointer directly above top of memory.
-    ld  sp,#0xffff
-
-    ;; Start of the program
-    call    _main
-    jp      _exit
-
-_exit:
-    halt
-    ; jp  _exit
-
-;; Ordering of segments for the linker.
-    .area   _HOME
-    .area   _CODE
-    .area   _INITIALIZER
-    .area   _GSINIT
-    .area   _GSFINAL
-
-    .area   _DATA
-    .area   _INITIALIZED
-    .area   _BSEG
-    .area   _BSS
-    .area   _HEAP
diff --git a/sw/z80/tests/usart/main.c b/sw/z80/tests/usart/main.c
deleted file mode 100644
index a905df2..0000000
--- a/sw/z80/tests/usart/main.c
+++ /dev/null
@@ -1,11 +0,0 @@
-#include "usart.h"
-#include <stdint.h>
-
-void main(void)
-{
-    usart_init(USART_BAUDRATE_1200, USART_PARITY_NONE, USART_STOP_BITS_1);
-
-    while (1) {
-        usart_write("Hello World!\n", 13);
-    }
-}
diff --git a/sw/z80/tests/usart/makefile b/sw/z80/tests/usart/makefile
deleted file mode 100644
index 8aaf6b1..0000000
--- a/sw/z80/tests/usart/makefile
+++ /dev/null
@@ -1,72 +0,0 @@
-####
-# source code settings
-#
-OSNAME := usart_test
- 
-CSOURCES 	:=  $(wildcard *.c)
-LIBS 		:= ../../arch/build/arch.a \
-			   ../../drivers/build/drivers.a
-
-OBJECTS 	:= $(patsubst %.c,build/%.rel,$(CSOURCES))
-HEXFILE		:= build/$(OSNAME).hex
-BINARY  	:= build/$(OSNAME).bin
-
-### 
-# compiler settings
-#
-CC 		:= sdcc
-
-CFLAGS	:= -mz80 \
-			--no-std-crt0 build/crt0.rel \
-			--allow-unsafe-read \
-			-I . \
-			-I ../../arch/include \
-			-I ../../drivers/include \
-			-DDEBUG
-
-LDFLAGS := -mz80 \
-			--no-std-crt0 build/crt0.rel \
-			-L ../../drivers/build \
-			-l drivers.a \
-			-pedantic \
-			--code-loc 0x0200
-			# --data-loc 0x2000
-
-.PHONY: flash dirs dis clean
-all: $(BINARY)
-
-flash: $(BINARY)
-	minipro -p M28C64 -w $< 
-
-# build binary
-$(BINARY): $(OBJECTS) dirs
-	$(CC) $(LDFLAGS) $(OBJECTS) -o $(HEXFILE)
-	makebin -s 8192 -yo 1 $(HEXFILE) $(BINARY)
-
-$(OBJECTS): build/%.rel : %.c $(CSOURCES) dirs build/crt0.rel $(LIBS)
-	@printf "\n"
-	$(CC) $(CFLAGS) -c $< -o $@
-
-$(LIBS): %.a:
-	@printf "\n"
-	make -C $(shell printf $@ | sed 's:build.*.::')
-
-build/crt0.rel: crt0.s
-	sdasz80 -o $<
-	@mv crt0.rel build/
-
-dirs:
-	mkdir -p build
-
-dis: $(BINARY)
-	dz80 -b -n -t $(BINARY)
-	r2 -a z80 $< \
-	-c 'afn main 0x200; \
-		pd 0x10; \
-		s 0x100; \
-		pd 10; \
-		s 0x200; \
-		pd 0x95'
-
-clean:
-	- rm -rd build