36 lines
491 B
ArmAsm
36 lines
491 B
ArmAsm
|
|
.export _cpeekchar
|
|
|
|
.import mul40
|
|
.importzp ptr4
|
|
|
|
.include "atari.inc"
|
|
|
|
.segment "CODE"
|
|
|
|
_cpeekchar:
|
|
|
|
lda ROWCRS
|
|
jsr mul40 ; destroys tmp4
|
|
clc
|
|
adc SAVMSC ; add start of screen memory
|
|
sta ptr4
|
|
txa
|
|
adc SAVMSC+1
|
|
sta ptr4+1
|
|
|
|
ldy COLCRS
|
|
lda (ptr4),y ; get char
|
|
tax
|
|
|
|
;; convert to asc
|
|
|
|
;; FIXME: ugly hack here to make tetris fx work :=P
|
|
lda #' '
|
|
cpx #0
|
|
beq @l
|
|
lda #0
|
|
@l:
|
|
ldx #0
|
|
rts
|