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cc65/libsrc/pce/clrscr.s

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.include "pcengine.inc"
.export _clrscr
_clrscr:
st0 #VDC_MAWR
st1 #<$0000
st2 #>$0000
st0 #VDC_VWR
ldy #$40
rowloop: ldx #$80
colloop:
lda #' '
staio VDC_DATA_LO
lda #$02
staio VDC_DATA_HI
dex
bne colloop
dey
bne rowloop
rts