Re: Star Wars Tie fighter issues

Another observation. The problem doesn't occur when the +5 is lower than 5,
4.9 seems to be just fine. But 5.04 no good.

Strange.

Kevin
 On Aug 21, 2012 12:42 PM, "Kevin Moore" <talon.k@gmail.com> wrote:

> 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 14:56:46 2012