Re: Taking a 16K PET to 32K (was Re: Zork on the PET at last!)

From: Nicolas Welte; address is valid for replies (Re:) only! (
Date: 2002-10-01 00:26:31

Ethan Dicks wrote:
> Adding a 32K SRAM is easy - pull the 8 4116s, wire up a 24-pin
> socket and use $8000 as the select line.  It would be easy enough
> to build a prototype board that hangs off the twin 50-pin connectors,
> or, in a pinch, use jumper wires to various places on the board.

If you don't want to mess with your machine, you might consider buying an 
expansion board kit from me, or etch your own board after my plans. It 
installs into the 6502 socket and you don't need to desolder the onboard RAM.

I'm going to have the boards manufactured in a shop, then I'll see how much 
it will cost. For a RAM expansion, the Flash ROM part does not have to be 
installed, so everything will be cheaper in the end. Also, the final design 
has a socket for the narrow cache SRAM chips as well, you can get them for 
free from old 486 mainboards. Read about it at

And I already tested it in a small screen 4016 with drilled out RAM 
sockets, so I'm sure it will work in your machine :-)


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