>> I guess there's no way to do it during VBLANK?
>
>Only if you need only very few different values and are able to poll the
>hardware registers in constant intervalls.
For Quadraside I was reading the paddles in the overscan. This worked fine, however I only had something like 13 paddle positions, This wouldn't do for Kaboom! but it might work for something like a driving game if you don't need too many wheel position - Particularly if you have something like: "Hard left", "Left", "Slight left", "Center", "Slight right", "Right", "Hard right".
Code follows:
;Start Overscan
lda #2
STA VBLANK ; Make TIA output invisible, and charge paddles
lda #30
sta TIM64T
lda #23
sta Player0x
sta Player1x
sta Player2y
sta Player3y
; jmp skippaddles
ldy #22
nextpa0:
lda #128
bit INPT0
bne donepa0 ;2/3
dec Player0x ;5
jmp donepa0a ;3
donepa0:
nop
nop
sta $30
donepa0a:
lda #128
bit INPT1
bne donepa1
dec Player1x
jmp donepa1a ;3
donepa1:
nop
nop
sta $30
donepa1a:
lda #128
bit INPT2
bne donepa2
dec Player2y
jmp donepa2a ;3
donepa2:
nop
nop
sta $30
donepa2a:
lda #128
bit INPT3
bne donepa3
dec Player3y
jmp donepa3a ;3
donepa3:
nop
nop
sta $30
donepa3a:
dey
bpl nextpa0
skippaddles:
OverscanWait:
lda INTIM
bne OverscanWait
JMP MainLoop ;Continue forever.
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