Tech: Centipede musroom problem

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

Before you say anything, i've looked through the archives and found
this same problem, but the fix doesn't work.

On powerup, the mushrooms are in a line down the left side. The
scorpion is always in the same row, and the spider does a full diagonal
every time, like Mark Spaeth said.

I've swapped the POKEY with a known good one, and that make absolutely
NO difference.

Any ideas?

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

check your traces and your socket. these can show up as a bad chip.
does flexing the board make a difference? does p1 or p0 show up in
test mode as bad?

phil

 

[Guest]

Archived from groups: rec.games.video.arcade.collecting (More info?)

pokey associated circuitry then, barring socket/trace issues. Least you know
the area to work in.

<penzone@gmail.com> wrote in message
news:1118087660.441943.275560@g43g2000cwa.googlegroups.com...
> Before you say anything, i've looked through the archives and found
> this same problem, but the fix doesn't work.
>
> On powerup, the mushrooms are in a line down the left side. The
> scorpion is always in the same row, and the spider does a full diagonal
> every time, like Mark Spaeth said.
>
> I've swapped the POKEY with a known good one, and that make absolutely
> NO difference.
>
> Any ideas?
>