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cc65/libsrc/telestrat/clrscr.s

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;
; jede jede@oric.org 2017-02-25
;
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.export _clrscr
.importzp sp
.include "telestrat.inc"
.proc _clrscr
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; Switch to text mode
BRK_TELEMON(XTEXT)
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lda #<SCREEN
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ldy #>SCREEN
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sta RES
sty RES+1
ldy #<(SCREEN+SCREEN_XSIZE*SCREEN_YSIZE)
ldx #>(SCREEN+SCREEN_XSIZE*SCREEN_YSIZE)
lda #' '
BRK_TELEMON XFILLM
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; reset prompt position
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lda #<(SCREEN+40)
sta ADSCRL
lda #>(SCREEN+40)
sta ADSCRH
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; reset display position
lda #$01
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sta SCRY
lda #$00
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sta SCRX
rts
.endproc