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sa: speed up the 80 column draw a bit

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This commit is contained in:
Vince Weaver 2018-05-24 13:53:07 -04:00
parent fe4ab8f2ba
commit 046c81f7a6
1 changed files with 5 additions and 8 deletions
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13
still_alive/display_art.s
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@ -107,7 +107,7 @@ eightycol_ascii_art:
art_line_loop80:
lda #0
lda #$00
sta DRAW_PAGE
clc
@ -161,24 +161,21 @@ done_ascii_total80:
;======================
store80:
pha
sty DISP_PAGE
ldy #0
lda DRAW_PAGE
and #$1
bne store80_odd
bit DRAW_PAGE
bmi store80_odd
store80_even:
pla
bit PAGE1
sta (GBASL),Y
dec DRAW_PAGE
jmp store80_done
store80_odd:
pla
bit PAGE0
sta (GBASL),Y
inc GBASL
store80_done:
inc DRAW_PAGE
store80_done:
ldy DISP_PAGE
rts