34 lines
798 B
ArmAsm
34 lines
798 B
ArmAsm
|
;
|
||
|
|
; Ullrich von Bassewitz, 2009-09-07
|
||
|
|
;
|
||
|
|
; unsigned char __fastcall__ videomode (unsigned char Mode);
|
||
|
|
; /* Set the video mode, return the old mode */
|
||
|
|
;
|
||
|
|
|
||
|
|
.export _videomode
|
||
|
|
.import SWAPPER, BSOUT
|
||
|
|
|
||
|
|
.include "c128.inc"
|
||
|
|
|
||
|
|
|
||
|
|
.proc _videomode
|
||
|
|
|
||
|
|
cmp MODE ; Do we have this mode already?
|
||
|
|
beq @L9
|
||
|
|
|
||
|
|
lda MODE ; Get current mode ...
|
||
|
|
pha ; ... and save it
|
||
|
|
|
||
|
|
jsr SWAPPER ; Toggle the mode
|
||
|
|
lda #14
|
||
|
|
jsr BSOUT ; Switch to lower case chars
|
||
|
|
pla ; Get old mode into A
|
||
|
|
|
||
|
|
; Done, old mode is in A
|
||
|
|
|
||
|
|
@L9: ldx #$00 ; Clear high byte
|
||
|
|
rts
|
||
|
|
|
||
|
|
.endproc
|
||
|
|
|