1 files changed, 38 insertions, 0 deletions
diff --git a/sw-old/z80/tests/usart/crt0.s b/sw-old/z80/tests/usart/crt0.s
new file mode 100644
index 0000000..c900065
--- /dev/null
+++ b/sw-old/z80/tests/usart/crt0.s
@@ -0,0 +1,38 @@
+    .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