From: jimn8@xxxxxxxxxx (Jim Nitchals)
>To reduce the overhead of your paddle routines, you could interleave
>the reads (only read one paddle every 2 scan lines, and alternate)
(...)
Thanks for these ideas...
>If you have dead cycles in your display code, you may find this useful
>instead:
> lda INPUT0
> asl
> adc Pot
> sta Pot
that's smarter code... :)
>I wonder if doing an extremely short capacitor dump cycle would cause
>the potentiometer values to change quick enough to read the pots in
>a short loop.
>
>i.e.
> lda #$80
> ldx #0
> sta VBLANK
> stx VBLANK
>
>then read the input ports *really quickly*.
>Just an idle thought - perhaps someone will give it a spin.
Do you mean 'stop and wait until the capacitor is charged'? Something like
this...
loop:
LDA INPUT0
BMI charged
INC Pot
BNE loop
charged:
No, this isn't possible - it is the first thing I tried - It takes too much
time; that cycle must be done during the main display loop.
(Jitter)
>It's a common problem. You need to compensate for it in software
(...)
>I believe the Supercharger sound test program de-jittered the paddles.
>I can't find the source to it at the moment, sorry, but it was posted
>to this list a while back.
At this point I do need the source code of a paddle game. If anyone has it
please post it to the list or send it to me!
Ciao,
P.
