mirror of
https://github.com/cc65/cc65.git
synced 2024-11-18 15:05:14 +00:00
37 lines
553 B
ArmAsm
37 lines
553 B
ArmAsm
|
|
;
|
|
; Maciej 'YTM/Elysium' Witkowiak
|
|
;
|
|
; 27.10.2001
|
|
|
|
; unsigned char revers (unsigned char onoff);
|
|
|
|
.export _revers
|
|
.importzp tmp1
|
|
|
|
.include "../inc/geossym.inc"
|
|
.include "../inc/const.inc"
|
|
|
|
_revers:
|
|
tax
|
|
bne L0 ; turn on
|
|
lda #0
|
|
.byte $2c
|
|
L0: lda #SET_REVERSE
|
|
sta tmp1
|
|
|
|
lda currentMode
|
|
tax
|
|
and #SET_REVERSE
|
|
tay ; store old value
|
|
txa
|
|
and #%11011111 ; mask out
|
|
ora tmp1 ; set new value
|
|
sta currentMode
|
|
|
|
ldx #0
|
|
tya
|
|
beq L1
|
|
lda #1
|
|
L1: rts
|