Re: GeoRAM Schematic

From: Howard Herman (hh_at_speakeasy.net)
Date: 2002-12-19 14:44:15

As I recall a GeoRam will only work for/in GEOS, unlike a real 1750.

Nick wrote:
> 
> I received a GeoRAM expansion the other day which I had bought on eBay to
> that I could checkout its memory refresh scheme. It uses 44256 chips, and so
> needs a refresh scheme as the VIC accesses won't be enough...
> 
> A couple questions:
> * before I reverse engineer the refresh logic, has someone else done it?
> * memory expansion, apparantly designs were made for this as well as the
> 1750, etc, but I've never come across them. Has anyone got the upgrade
> schematic?
-- 
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