mirror of
https://github.com/cc65/cc65.git
synced 2024-11-19 06:31:31 +00:00
30 lines
637 B
ArmAsm
30 lines
637 B
ArmAsm
;
|
|
; 2016-02-28, Groepaz
|
|
; 2017-06-19, Greg King
|
|
;
|
|
; unsigned char cpeekrevers (void);
|
|
;
|
|
|
|
.export _cpeekrevers
|
|
|
|
.import plot
|
|
.import CURS_X: zp, CharPtr: zp
|
|
|
|
.include "cbm610.inc"
|
|
|
|
|
|
_cpeekrevers:
|
|
ldx IndReg
|
|
ldy #$0F
|
|
sty IndReg
|
|
|
|
ldy CURS_X
|
|
lda (CharPtr),y ; get char from system bank
|
|
stx IndReg
|
|
ldx #>$0000
|
|
and #$80 ; get reverse bit
|
|
asl a
|
|
tax ; ldx #>$0000
|
|
rol a ; return boolean value
|
|
rts
|