Simple monitor program

2026-09-28 13:36:52 +02:00
parent 67ec3c9a65
commit bedcbfdd24
6 changed files with 368 additions and 76 deletions
@@ -7,6 +7,7 @@ DELAY_LOOPS_PER_MS = 40
        .globl _io_in
        .globl _enable_interrupts
        .globl _disable_interrupts
+        .globl _jump_to
        .globl s__DATA
        .globl l__DATA
        .globl s__INITIALIZER
@@ -153,6 +154,11 @@ _io_in::
        in      a, (c)
        ret

+; Execute code at HL. Because this routine is entered with CALL, a RET in the
+; target returns to the monitor immediately after jump_to().
+_jump_to::
+        jp      (hl)
+
 ; Approximate millisecond delay.
 ; Input: HL = delay in milliseconds.
 _delay_ms::