Re: Defender controls no longer working

Replace the 6821 PIA.

On Fri, 21 Feb 2003 18:10:25 -0800 (PST), Neil Bradley wrote:

>Well Jeez, I managed to get my Defender working perfectly (no more
>resetting, failed RAM tests, etc..) after:
>
>* Removing the power supply board completely
>
>* Tinning the leads so they soldered nicely to the power supply
>
>* Reseating and cleaning all connectors in the cabinet
>
>* Adjusting the voltage output so the 12 volt rail wasn't 14 volts, the 5
>volt rail wasn't 6 volts, and the -5 volt rail wasn't -6 volts
>
>* Reseating/cleaning all of the EPROMs on the ROM board
>
>The game is working perfectly now except for one annoying problem - THE
>CONTROLS NO LONGER WORK! I'm getting 4.97 volts to the 6821 on the control
>board as I'd expect.
>
>Did I just do something stupid? From what I can tell, the ROM board is
>powered from the main CPU board, so everything SHOULD be OK! Any thoughts
>would be greatly appreciated.
>
>-->Neil
>
>-------------------------------------------------------------------------------
>Neil Bradley In the land of the blind, the one eyed man is not
>Synthcom Systems, Inc. king - he's a prisoner.
>ICQ #29402898
>
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Steven Gregory
ArcadeShop Amusements
sgregory@arcadeshop.com
http://www.arcadeshop.com

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Received on Mon Feb 24 10:18:23 2003