Re: Defender RAMs

>A while back, you had a web page that described how to hook up 4164 RAM
>to Williams games. Do you still have this page up somewhere? I need to
>install these chips into my Defender, and I didn't have the pinouts of
>either chip handy, so I thought your how-to guide would be a great
>resource. And now, of course, when I went to look for it, I couldn't
>find it anymore. :-(

My webpage *should* be back tomorrow at a new address. In the mean-time I
think the modification was something like:

Bend out pin 1 so it won't go in the socket (or snip it off)
Bend out pin 8 so it won't go in the socket (or snip it off, but leave a tab)
Solder a little wire from pin 9 to pin 8.

You can also do it 256kx1 DRAMs, but I think you need to pull pin 1 high or low.

>BTW, a while back, I bought a NOS WG HV transformer from Gaymond. I
>haven't had occasion to use it yet. I thought I was going to need it,
>before I learned much about WG HV units (i.e. they almost never fail).
>At any rate, I remember you saying that there are WG look alike HV
>transformers for this monitor that played a cruel joke on you, because
>they look the same, or similar, but were not in fact the real McCoy so
>to speak. How would you tell the difference between the real part, and
>the incorrect one? I want to make sure that mine is a valid
>replacement.

There will be a part-number sticker on the HV transformer. The "fake" ones
carry a different number. Otherwise the only way to tell is to ohm out the
pins on the bottom. That info is also on my webpage-- in the "test a WG
transformer" page.

-Clay

Clayton N. Cowgill Engineering Manager
_______________________________________________________________________
/\ Diamond Multimedia Systems, Inc. clay@supra.com
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Received on Thu Jan 8 15:49:26 1998