mirror of
https://github.com/cc65/cc65.git
synced 2024-11-04 17:04:58 +00:00
41 lines
474 B
ArmAsm
41 lines
474 B
ArmAsm
|
;
|
||
|
|
; Ullrich von Bassewitz, 23.09.1998
|
||
|
|
;
|
||
|
|
; unsigned readjoy (unsigned char joy);
|
||
|
|
;
|
||
|
|
|
||
|
|
.export _readjoy
|
||
|
|
|
||
|
|
.include "../inc/geossym.inc"
|
||
|
|
|
||
|
|
.proc _readjoy
|
||
|
|
|
||
|
|
tax ; Joystick number into X
|
||
|
|
bne joy2
|
||
|
|
|
||
|
|
; Read joystick 1
|
||
|
|
|
||
|
|
joy1: lda #$7F
|
||
|
|
sei
|
||
|
|
sta cia1base
|
||
|
|
lda cia1base+1
|
||
|
|
cli
|
||
|
|
and #$1F
|
||
|
|
eor #$1F
|
||
|
|
rts
|
||
|
|
|
||
|
|
; Read joystick 2
|
||
|
|
|
||
|
|
joy2: ldx #0
|
||
|
|
lda #$E0
|
||
|
|
ldy #$FF
|
||
|
|
sta cia1base+2
|
||
|
|
lda cia1base+1
|
||
|
|
sty cia1base+2
|
||
|
|
and #$1F
|
||
|
|
eor #$1F
|
||
|
|
rts
|
||
|
|
|
||
|
|
.endproc
|
||
|
|
|