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waterfall: sound in two frames

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This commit is contained in:
Vince Weaver 2018-08-03 18:32:20 -04:00
parent 8dabc9876a
commit 8025cf19c7
1 changed files with 70 additions and 54 deletions
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124
waterfall/waterfall.s
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@ -222,8 +222,8 @@ loopB:
jmp display_loop
jump_table:
.word (display_odd-1)
.word (display_even-1)
.word (display_odd-1)
.word (display_three-1)
.word (display_four-1)
jump_addr:
@ -1269,62 +1269,78 @@ display_three:
three_first_four_lines:
; line 0
; we do mockingboard here
; we have 222 cycles (65*4 = 260 - 38 = 222)
; 38
; come in with 38
; 222 - 100 = 122 to kill
; kill 122
ldx #10 ; 2
dummy_loop2:
asl DUMMY ; 6
dex ; 2
bne dummy_loop2 ; 3
; -1 exit loop
; 11 left over
nop ;2
lda XPOS ; 3
lda XPOS ; 3
lda XPOS ; 3
; high = 5 + 12+ 3 = 20
; medium = 5 + 9 + 6 = 20
; low = 5 + 9 + 6 = 20
lda XPOS ; 3
; cmp OLD_XPOS ; 3
; beq skip_mb2 ;
; 2
; sta OLD_XPOS ; 3
cmp #23 ; 2
bmi check_medium2
; 2
lda #35 ; 2
sec ; 2
sbc XPOS ; 3
sta YPOS ; (nop) ; 3
was_low2:
jmp write_volume2 ; 3
check_medium2:
; 3
nop ; 2
nop ; 2
cmp #12 ; 2
bmi was_low2
was_medium2:
; 2
lda #12 ; 2
nop ; 2
write_volume2:
; write A/noise volume
sta MB_VALUE ; 3
ldx #8 ; 2
lda #$2 ; 2
jsr write_ay_both ; 6+65
;===============
; 78
skip_mb2:
; setup loop for next section
ldy #4 ; 2
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
lda YPOS ; 3
nop ; 2
nop ; 2
; line 1, 65 cycles
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
lda YPOS ; 3
nop ; 2
; line 2, 65 cycles
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
lda YPOS ; 3
nop ; 2
; line 3, 65 cycles
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
asl DUMMY ; 6
lda YPOS ; 3
nop ; 2
three_twinkle_stars:
twinkle_loop_three: