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xmas2018: get colors right on scroll
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@ -312,7 +312,8 @@ scroll_done:
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; increment and loop: 7
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; 5 return
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;
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; total = (93*40)+7=3727
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; original total = (93*40)+7=3727
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;
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hgr_scroll_line:
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ldy #0 ; 2
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@ -328,7 +329,21 @@ hgr_scroll_line_loop:
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dey ; restore Y ; 2
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;============
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; 20
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get_offpage_byte:
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cpy #39 ; 2
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bne not_thirtynine ; 3
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sty TEMPY ; 3
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ldy #0 ; 2
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lda (INL),Y ; 5
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sta NEXT ; 3
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ldy TEMPY ; 3
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not_thirtynine:
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;===================
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; usually: 5
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; if in bit 2 or 6 of horiz scroll, shift the color bit over
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; makes some color flicker, is there a better way?
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high_bit:
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lda COUNTL ; 3
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cmp #2 ; 2
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@ -348,18 +363,8 @@ done_high_bit:
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;===================
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; worst: 22
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get_offpage_byte:
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cpy #39 ; 2
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bne not_thirtynine ; 3
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sty TEMPY ; 3
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ldy #0 ; 2
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lda (INL),Y ; 5
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sta NEXT ; 3
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ldy TEMPY ; 3
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;===================
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; usually: 5
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not_thirtynine:
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prepare_bits:
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; get right byte, bottom 2 bits, shifted left to be in 6+5
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lda NEXT ; 3
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and #$3 ; 2
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@ -372,6 +377,7 @@ not_thirtynine:
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;==========
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; 18
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output_new:
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; get current, mask off bottom 2 bits (no longer needed)
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; then OR in the saved high (color) bit as well as NEXT bits
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lda CURRENT ; 3
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