Re: Defender power supply requirements

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I have used both computer and video game switching supplies with no
problems on my Williams games. No issues with corrupt memory - and 'if'
that is the case I would suspect that the power-up reset circuit on the MPU
is failing. After all CPU's all want about 2 - 500ms of RESET before going
'live' and any switching supply worth it's salt will provide power in under
100ms. So if you have a problem with memory corruption, then I would be
replacing any timing capacitors in the RESET circuit...

As far as I can see Williams made no effort for their supply to come up in
any particular order...they all boot at once.

John :-#)#

At 02:46 PM 19/02/2003 -0800, Neil Bradley wrote:

>Any idea what the crurent supply/voltage supply requirements are for
>Defender? If I read the schematics right, it needs +12, +5, and -5. I am
>unsure of the power consumption requirements.
>
>It almost looks as if a PC's power supply would do the trick. Am I wrong
>about this?
>
>Thanks!
>
>-->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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Received on Wed Feb 19 22:14:51 2003