mirror of
https://github.com/cc65/cc65.git
synced 2024-11-03 10:07:02 +00:00
53dd513176
which included commits to RCS files with non-trunk default branches. git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
43 lines
519 B
ArmAsm
43 lines
519 B
ArmAsm
;
|
|
; Ullrich von Bassewitz, 22.09.1998
|
|
;
|
|
; void clrscr (void);
|
|
;
|
|
|
|
.export _clrscr
|
|
.import plot
|
|
|
|
.include "zeropage.inc"
|
|
|
|
.proc _clrscr
|
|
|
|
lda #0
|
|
sta CURS_X
|
|
sta CURS_Y
|
|
jsr plot ; Set cursor to top left corner
|
|
|
|
lda IndReg
|
|
pha
|
|
lda #$0F
|
|
sta IndReg ; Switch to the system bank
|
|
|
|
ldx #8
|
|
ldy #$00
|
|
lda #$20 ; Screencode for blank
|
|
L1: sta (CharPtr),y
|
|
iny
|
|
bne L1
|
|
inc CharPtr+1
|
|
dex
|
|
bne L1
|
|
|
|
pla
|
|
sta IndReg ; Restore old indirect segment
|
|
|
|
jmp plot ; Set screen pointer again
|
|
|
|
.endproc
|
|
|
|
|
|
|