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cc65/libsrc/geos/conio/clrscr.s
izydorst 8ce6c9bcac simple conio support for GEOS
git-svn-id: svn://svn.cc65.org/cc65/trunk@1093 b7a2c559-68d2-44c3-8de9-860c34a00d81
2001-10-27 17:13:22 +00:00

36 lines
564 B
ArmAsm

;
; Maciej 'YTM/Elysium' Witkowiak
;
; 27.10.2001
; void clrscr (void);
.export _clrscr
.include "../inc/jumptab.inc"
.include "../inc/geossym.inc"
.include "../inc/const.inc"
_clrscr:
lda #ST_WR_FORE | ST_WR_BACK
sta dispBufferOn
lda #0
jsr SetPattern
lda #0
sta r3L
sta r3H
sta r2L
lda #199
sta r2H
lda graphMode
bpl L40
lda #>639 ; 80 columns
ldx #<639
bne L99
L40: lda #>319 ; 40 columns
ldx #<319
L99: sta r4H
stx r4L
jmp Rectangle