Little bit of a guess here, but other boards use the pokey chip to generate random #s, could this be
a bad pokey?
just a thought..
cheers
/Tim
On 12/10/2012 9:52 PM, Alan McCormick wrote:
> The attract mode with the scrolling text appears fine and the sound works perfectly. Even the wave
> select screen looks normal. Unfortunately TIE fighters/fireballs/starfield objects are FUBARed.
> During the TIE fighter sequence all the ships and fireballs appear at 0,0 (which makes it stupidly
> easy to kill them). They blink in and out of view at seemingly random angles and sizes. The
> starfield also pops in and out. During the trench sequence everything is squished into the middle
> of the X axis and it is apparently impossible to hit the exhaust port. I ran the self test hoping
> it would give me a hint but alas it couldn't find any mathbox or matrix errors. Even the scaling
> tests were perfect.
>
> Video on Youtube http://www.youtube.com/watch?v=ZsoUcedoV-8
>
> I've swapped out the mathbox PROMs with ESB PROMs with no change. The AVG IC is known to be good
> and I'm pretty sure the SRAMs on the video board are good as well.
>
> While I've fixed PCB problems on Tempests, Battlezones and Space Duels in the past, this one is
> going to be a tough nut to crack. Any suggestions for what to check next?
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com
Received on Tue Dec 11 07:22:39 2012
This archive was generated by hypermail 2.1.8 : Tue Dec 11 2012 - 11:50:01 EST