screwy Asteroids problem (running in Asteroids Deluxe cabinet)

Sorry on the first message, accidently hit send.

This is a screwy problem, and it's screwy to describle, but it's driving me
crazy, so please bear with me, I'll describe it as best I can.

I'm running Asteroids in a standard Asteroids Deluxe upright. I'm using the
ROMs hacked by Mark Shostak as mentioned here:
http://www.ionpool.net/arcade/asteroids/asteroids_mod.txt. These hacked
ROMs fix everything except the inverted image as Asteroids Deluxe uses the
mirror. (FYI, Mark's ROMs will work without further modification in an
Asteroids Deluxe cabaret as that doesn't use a mirror). To fix the mirror
inverted image problem, I swapped the red & blue wires running from the
monitor deflection board to the yoke.

My problem is that the game will randomly switch the image to upside down.
That is upside down when you're looking at the corrected inverted image on
an AD cabinet. It doesn't happen often, it happened 3 times yesterday
during a 5 hour game party, once in the middle of a game. It's hard to trap
on a pic, but here's an attempt:

http://www.tollianweb.com/uc/upside_down_edit.jpg

Couple notes, it appears to like the upside down image more than the correct
image because it seems to spend most of it's time that way. I have not been
able to isolate anything that makes it flip images. Sometimes it happens
when you turn it off and on, and as I said, one time it happened right while
people were playing.

What really makes this weird is that the controls, left and right, will
operate correctly, even when the image is flipped, i.e., you press rotate
right, and you'll rotate right. That is not consistent with the hacked ROMs
in an AD upright without swapping the yoke wires. If you just used the
hacked ROMs and didn't swap the yoke wiring, when you press rotate right, it
actually shos rotates left (on the invereted image).

So does anyone (Mark S? Neil (who Mark gives a lot of credit for help with
the hack)?) have any idea what may be causing this? It's pretty clear to me
at least that it's on the Asteroids PCB because I can run a regular
Asteroids Deluxe PCB in there forever and there's no problems. Thanks,

Joe
joemagiera@ameritech.net

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Received on Sun Apr 2 15:00:26 2006