Ok, I have some interesting new questions.
1) Why must that DEX thing be at the end of the Kill loop in order to draw
a playfield?
2) Why is my playfield always black (it is on the sides of the screen.
Difficult to see, but it is there)
3)In regards to sound, when I delete the ; before the BNE, it doesn't give
me the effect I want, which is a glissando thru all the frequency values.
Is it going too fast? Have I forgot something?
-John K. Harvey
Source code:
processor 6502
include vcs.h
ORG $F000
START: CLD
SEI
LDX #$FF
LDA #0
B1: STA 0,X
DEX
BNE B1
MAIN: LDX #0
LDA #2
STA WSYNC
STA WSYNC
STA WSYNC
STA VSYNC
STA WSYNC
STA WSYNC
LDA #44
STA TIM64T
LDA #0
STA CXCLR
STA WSYNC
STA VSYNC
DRAW:
LDA INTIM
BNE DRAW
STA WSYNC
STA VBLANK
LDA #3
STA CTRLPF
LDY #191
LDX #239
LOOPER:
TYA
LDA #8
STX COLUBK
DEX
DEX
CPX #$F
BNE FISH; If colors are that ugly black or that repeating brown, skip
LDX #239; (255-16)
FISH:
STA WSYNC; draws one line
DEY
BNE LOOPER
LDA #2
STA WSYNC
STA VBLANK
LDA #32; playfield stuff? Why won't you work?
STA COLUPF
LDA #$10
STA PF0
LDA #10
STA AUDV0
STA AUDC0
LDX #10
FOO:
STX AUDF0
INX
CPX #31
;BNE FOO;when uncommented, it makes a terrible noise.
KILL: STA WSYNC
DEX ; Why must this be here in order to draw a playfield?
BNE KILL
JMP MAIN
ORG $FFFC
.word START
.word START
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