At 11:41 AM 10/3/97 -0500, you wrote:
>
>On Fri, 3 Oct 1997, Mit Matelske wrote:
>
>>
>>
>> Thanks to all!!!
>>
>> After adjusting *every* pot on that monitor, I have a decent looking
>> Star Castle game. One question - the background noise is just
>> static - and I'm not talking about good static. The explosions
>> sound great, but this constant noise...
>
>
>> It's been a while since I played the game and was wondering what
>> the background sounds (music? - just kidding) are suupose to
>> be, and how to diagnose and fix the sound board.
>
> The background sound should be a pulsing tone that gets faster
>pulsing as you shoot more and more segments out of the Star Castle.
>
> The Manual has an awesome section on how to diagnose the Sound
>board. If you don't have a copy, check on wiretap, but I'm not sure its
>there. Send me an email if you need a copy.
>
> Folow the procedure in the manual, but the background noise is
>generated by a cheesy DAC, a level shifter and limiter, and a VCO. First
>thing I would check is the VCO (an LM566 -- National has the datasheet on
>their web page) if you are getting static. You should get a nice
>low-frequency square wave out of there (use a scope to check.)
>
>Joe
>
>
Joe-
Could you email me that sound board diagnostic stuff...
Checked on spies and could only find schematics.
Thanks,
Mit
