Re: Star Wars Tie fighter issues

OK so back to this star wars issue. I got some time to sit with it, and
found something interesting which I'm not sure what to make of. I started
using my bug trap to look for issues, and when I put it on 6h part of the
matrix processor counter the problem goes away. Its an ls191 I didn't see
any fault light come up on the bug trap but went ahead and replaced. The
original ls191 checked OK and the problem still occurs. It will go away if
I put the bug trap on. So I started checking other chips that had db0 and
db1 coming out. I piggybacked the ls244 on 4j the problem went away, so I
replaced it and check again. Problem still present. If I piggy back the
ls244 again no problem.

The only things that are common between the two chips are db0 and db1 so I
believe there is a problem somewhere on the DB buss.

Thoughts ?

Kevin
 On Aug 2, 2012 3:00 PM, "vectorlist-steve" <vectorlist@arcadehacking.com>
wrote:

> I just watched the video a second time and you can clearly see the stars
> instantly spread out just as the tie fighters expand in size right at the
> 11 second mark. The jumbo sized objects also return to normal at 47
> seconds in. Interesting!
>
>
> On 8/2/2012 12:54 PM, vectorlist-steve wrote:
>
>> Video shows not only the tie fighters having issues but possibly the
>> death start and trench too. It really looks like a scaling issue but it
>> recovered a few seconds into the trench run. Hummmm
>>
>>
>> On 8/2/2012 12:48 PM, Kevin Moore wrote:
>>
>>> Ok enough about Battlezone headers hacks etc. Let's get back to this
>>> Star Wars board.
>>>
>>> Here's the video incase you haven't already seen it, or as a refresher.
>>>
>>> http://www.youtube.com/watch?**v=XiKbXX4T8ew<http://www.youtube.com/watch?v=XiKbXX4T8ew>
>>>
>>> Break down.
>>>
>>> Voltages good.
>>> Swapped out with known good main board no more problem. So problem
>>> follows Main board.
>>>
>>> Self tests do no indicate any problems. Hardware, Matrix, or Scaling.
>>>
>>> So far I have replaced Prom sockets, CPU sockets.
>>> Have verified Proms, and replaced JIC
>>> Replaced all Ram JIC.
>>> Swapped out and checked all Eproms.
>>>
>>> So unless I'm missing something else easy all the easy stuff is done.
>>>
>>> Does it cold, does it hot. No waiting for the game to warm up for this
>>> to happen. Very repeatable.
>>>
>>> Attract mode works fine. Once you pick a level, and start Stars look
>>> good, but as soon as the first Tie appears they go into like a slow motion
>>> movement, and it causes a slight rainbow color affect on the monitor. I
>>> believe because it's trying to over drive the monitor.
>>>
>>> Kevin
>>>
>>>
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>
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Received on Tue Aug 21 13:42:34 2012