mirror of
https://github.com/cc65/cc65.git
synced 2024-12-27 15:29:46 +00:00
52 lines
1.0 KiB
ArmAsm
52 lines
1.0 KiB
ArmAsm
|
;
|
||
|
|
; 2016-02-28, Groepaz
|
||
|
|
; 2017-06-26, Greg King
|
||
|
|
;
|
||
|
|
; unsigned char cpeekrevers (void);
|
||
|
|
;
|
||
|
|
|
||
|
|
.export _cpeekrevers
|
||
|
|
|
||
|
|
.include "zeropage.inc"
|
||
|
|
.include "c128.inc"
|
||
|
|
|
||
|
|
|
||
|
|
_cpeekrevers:
|
||
|
|
lda MODE
|
||
|
|
bmi @c80
|
||
|
|
|
||
|
|
ldy CURS_X
|
||
|
|
lda (SCREEN_PTR),y ; get char
|
||
|
|
|
||
|
|
@return:
|
||
|
|
and #$80 ; get reverse flag
|
||
|
|
asl a
|
||
|
|
tax ; ldx #>$0000
|
||
|
|
rol a ; return boolean value
|
||
|
|
rts
|
||
|
|
|
||
|
|
@c80:
|
||
|
|
lda SCREEN_PTR
|
||
|
|
ldy SCREEN_PTR+1
|
||
|
|
clc
|
||
|
|
adc CURS_X
|
||
|
|
bcc @s
|
||
|
|
iny
|
||
|
|
|
||
|
|
; get byte from VDC mem
|
||
|
|
@s: ldx #VDC_DATA_LO
|
||
|
|
stx VDC_INDEX
|
||
|
|
@L0: bit VDC_INDEX
|
||
|
|
bpl @L0
|
||
|
|
sta VDC_DATA
|
||
|
|
dex
|
||
|
|
stx VDC_INDEX
|
||
|
|
sty VDC_DATA
|
||
|
|
|
||
|
|
ldx #VDC_RAM_RW
|
||
|
|
stx VDC_INDEX
|
||
|
|
@L1: bit VDC_INDEX
|
||
|
|
bpl @L1 ; wait for blanking
|
||
|
|
lda VDC_DATA
|
||
|
|
jmp @return
|