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waterfall: waterfall itself is fine when odd

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This commit is contained in:
Vince Weaver 2018-08-03 12:44:06 -04:00
parent b54d2805b4
commit 3ce415bb5c
1 changed files with 60 additions and 20 deletions
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80
waterfall/waterfall.s
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@ -226,7 +226,7 @@ display_loop:
even:
; 3
nop ; (nop) ; 2
jsr display_even ; 6
jsr display_odd ; 6
jmp vblank ; 3
@ -236,18 +236,20 @@ vblank:
; We have 4550 cycles in the vblank, use them wisely
;======================================================
; do_nothing should be 4550
; -8 letfover from HBLANK code
; -9 letfover from HBLANK code
; -49 check for keypress
; -2252 copy screen
; -2231 draw sprite
; =============
; 10 cycles
; 9 cycles
; jsr do_nothing ; 6
; 17 cycles
inc YPOS ; 5
inc YPOS ; 5
nop
nop
; inc YPOS ; 5
; inc YPOS ; 5
; nop ; 2
; nop ; 2
@ -594,8 +596,8 @@ display_odd:
odd_first_four_lines:
; line 0
; 23
ldy #94 ; 2
; 21
ldy #47 ; 2
asl DUMMY ; 6
asl DUMMY ; 6
@ -652,10 +654,10 @@ odd_first_four_lines:
odd_twinkle_stars:
outer_loop_odd:
falls_loop_odd:
; line 0
bit PAGE0 ; 4
; delay 29
asl DUMMY ; 6
asl DUMMY ; 6
@ -663,13 +665,11 @@ outer_loop_odd:
asl DUMMY ; 6
lda YPOS ; 3
nop ; 2
; falls
bit PAGE1 ; 4
lda YPOS ; 3
bit PAGE0 ; 4
; endfalls
; delay 21
asl DUMMY ; 6
asl DUMMY ; 6
@ -677,9 +677,7 @@ outer_loop_odd:
lda YPOS ; 3
; line 2
bit PAGE0 ; 4
; delay 29
asl DUMMY ; 6
asl DUMMY ; 6
@ -687,20 +685,62 @@ outer_loop_odd:
asl DUMMY ; 6
lda YPOS ; 3
nop ; 2
bit PAGE0 ; 4
; falls
bit PAGE1 ; 4
lda YPOS ; 3
bit PAGE0 ; 4
; end falls
; delay 21
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
lda YPOS ; 3
; line 3
bit PAGE0 ; 4
; delay 29
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
lda YPOS ; 3
nop ; 2
; falls
bit PAGE0 ; 4
lda YPOS ; 3
bit PAGE0 ; 4
; end falls
; delay 21
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
lda YPOS ; 3
; line 4
bit PAGE0 ; 4
; delay 29
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
lda YPOS ; 3
nop ; 2
; falls
bit PAGE0 ; 4
lda YPOS ; 3
bit PAGE0 ; 4 ; 44
; end falls
; delay 21 - 7 from loop
asl DUMMY ; 6
asl DUMMY ; 6
nop ; 2 ; 58
dey ; 2
bne outer_loop_odd ; 2/3
beq falls_loop_odd_done ;
; 2
jmp falls_loop_odd ; 3
falls_loop_odd_done:
; 3
nop ; 2
rts ; 6