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cc65/libsrc/atari7800/mono_clrscr.s

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.include "atari7800.inc"
.export _mono_clrscr
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.import _mono_screen
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.import pusha0,pushax
.include "extzp.inc"
.code
.proc _mono_clrscr
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lda #<_mono_screen
ldx #>_mono_screen
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sta ptr7800
stx ptr7800+1
ldx #screenrows
@L1: ldy #mono_charsperline
lda #0
@L2: sta (ptr7800),y
dey
bne @L2
lda ptr7800
clc
adc #mono_charsperline
bcc @L3
inc ptr7800+1
@L3: dex
bne @L1
rts
.endproc
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;-------------------------------------------------------------------------------
; force the init constructor to be imported
.import mono_initconio
conio_init = mono_initconio