OBERHEIM SYNTH

--- In oberheim@yahoogroups.com, "Rick Massey" <seafox@...> wrote:
>
> Okay, well, here's a couple more things to look at.
> 
> I remember Oberheim had two upgrades to the units, a card reader that could
> be installed and a memory swap that would give the unit a lot more patch
> locations. This would be good to search out data on. 

I was taking with a guy about a year ago who said that he did in fact increase the memory of 
his Perf/X units. He told me that one just pops in a compatable RAM chip of a larger size. 
Mine have some kind of 6k Sony RAM, I'll check later as I just put them back together. 
Anyway I don't know much about the type of RAM used, and cursory searching hasn't turned 
up much. As I get back into these things I'll sort out the details. Another option is always to 
piggyback another of the same chip and install a bank select switch.

As for the card reader, I have read speculation about them - but I have never seen one 
installed, nor has anyone else I've asked. My guess is that they either never happened or are 
quite rare. On the left of the Perf/X PCB is a blank area for soldering in a card reader, but I 
don't know what type it was intended for. I'll look into how it was wired into the CPU buss, 
maybe this could make for a fun project!