dos33fsprogs/games/mist/gr_plotpoint.s

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; turn on double high point at CH,CV
plot_point:
lda CV ; y
lsr
lsr
and #$fe ; make even
tax
lda gr_offsets,X
sta OUTL
lda gr_offsets+1,X
clc
adc DRAW_PAGE
sta OUTH
lda CH ; X * 2
lsr
tay
plot_color:
lda #$77
sta (OUTL),Y
rts