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waterfall: this is taking forever
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@ -104,13 +104,13 @@ waterfall_demo:
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; setup graphics for vapor lock
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;==============================
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; Clear Page0
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; Clear Page0 to all green
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lda #$0
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sta DRAW_PAGE
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lda #$44
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jsr clear_gr
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; Make screen half green
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; Make top half of screen blue, down to line 26
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lda #$11
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ldy #24
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jsr clear_page_loop
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@ -134,27 +134,43 @@ waterfall_demo:
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; to avoid false positive found if the horiz blanking is mirroring
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; the line (max 3 repeats in that case)
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vapor_lock_loop: ; first make sure we have all zeroes
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LDA #$11
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vapor_lock_loop: ; first make sure we have all blue
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lda #$11 ; 2
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zxloop:
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LDX #$04
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ldx #$04 ; 2
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wiloop:
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CMP $C051
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BNE zxloop
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DEX
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BNE wiloop
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cmp $C051 ; 4
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bne zxloop ; 2/3
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dex ; 2
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bne wiloop ; 2/3
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LDA #$44 ; now look for our border color (4 times)
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lda #$44 ; now look for our color (4 times) ; 2
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zloop:
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LDX #$04
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ldx #$04 ; 2
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; what cycle does CMP happen at?
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; while matching match = 4+2+2+3 = 11???
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; if start at x=0, 0, 11, 22, 33 exit at 43
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; if start at x=1, 1, 12, 23, 34 exit at 44
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; if start at x=2, 2, 13, 24, 35 exit at 45
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; if start at x=3, 3, 14, 25, 36 exit at 46
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; if start at x=4, 4, 15, 26, 37 exit at 47
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; if start at x=5, 5, 16, 27, 38 exit at 48
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; if start at x=6, 6, 17, 28, 39 exit at 49
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; if start at x=7, 7, 18, 29, *40 exit at **
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; if start at x=8, 8, 19, 30, *41 exit at **
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; if not match, 2+4+3 = 9, first match = 8
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qloop:
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CMP $C051
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BNE zloop
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DEX
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BNE qloop
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cmp $C051 ; 4
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bne zloop ; 2/3
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dex ; 2
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bne qloop ; 2/3
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; found first line of black after green, at up to line 26 on screen
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; so we want roughly 22 lines * 4 = 88*65 = 5720 + 4550 = 10270
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; so we want roughly 22 lines * 4 = 88*65 = 5720 + 4550 = 10270
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; - 65 (for the scanline we missed) = 10205 - 12 = 10193
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jsr gr_copy_to_current ; 6+ 9292
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@ -575,9 +591,11 @@ outer_loop_even:
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display_odd:
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odd_first_four_lines:
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odd_first_two_lines:
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ldy #95 ; 2
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; line 0
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; 23
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ldy #94 ; 2
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asl DUMMY ; 6
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asl DUMMY ; 6
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@ -587,6 +605,8 @@ odd_first_two_lines:
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asl DUMMY ; 6
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asl DUMMY ; 6
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; line 1, 65 cycles
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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@ -600,7 +620,37 @@ odd_first_two_lines:
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lda YPOS ; 3
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nop ; 2
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; line 2, 65 cycles
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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lda YPOS ; 3
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nop ; 2
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; line 3, 65 cycles
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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asl DUMMY ; 6
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lda YPOS ; 3
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nop ; 2
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odd_twinkle_stars:
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outer_loop_odd:
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