23 lines
487 B
NASM
23 lines
487 B
NASM
.define debug_pointer $0080
|
|
|
|
.MACRO printf
|
|
ldy.w #\1 ; load add of the string
|
|
sty.w debug_pointer ; store address in defined mem area
|
|
ldy #0 ; zero y
|
|
jsr do_printf
|
|
.ENDM
|
|
|
|
|
|
|
|
.BANK 0
|
|
.SECTION "debug" SEMIFREE
|
|
|
|
do_printf:
|
|
lda (debug_pointer),y ; get address of string
|
|
sta $3000 ; write to MMIO debug reg
|
|
iny
|
|
cmp #0 ; len 5
|
|
bne do_printf
|
|
rts
|
|
.ENDs
|