Vintage Simmons Drums (UK) Users Group

--- In Simmons_Drums@yahoogroups.com, "blacklodgeed" <edrose1@...> wrote:
>
> Hey everyone.
> I just uploaded some pictures of the Simmons 20-85 card. This is the
daughter card that 
> allows the SDS 7 modules to access four different eproms. The
different eproms are selected 
> using the resonance control - which kind of sucks because it means
you lose that control, 
> but but being able to access the different eproms is awesome.
> I do have one question, though... There's a variable resistor on the
card that I have no idea 
> what it does. Resonance control, perhaps?  Any help would be greatly
appreciated.

I always thought that the lower two bits of the resonance control
became the ROM selects.

It's interesting to see that you've got an unpopulated card - can you
send me a pics of each side of the board in as high a resolution as
you can manage, off-list (or upload them somewhere I can grab them),
and a fairly high-res pic (enough to identify the chips) of the
populated board?

Gordon