Re: GEOS cartridge

Date: Tue, 18 Jun 2013 19:58:05 +0200
Message-ID: <>
Hallo allemaal,

The good news: I replaced the unmarked ICs with marked ones and 
things worked out fine!

Then a bit lesser good news for the most of you: it appears to be a 
Dutch version of GEOS. To be honest, I even didn't know it existed. 
But I hardly used GEOS at all.

Daniel V. Mackey wrote:
> That sounds cool, can you provide High quality pics of the 
> PCB and ROM dumps of the two 27256 EPROMS?

Why do you need the pictures? Maybe I have something better:

It contains the schematic, PNG as well as Eagle source, and two 
BINs. The start code for the whole can be found at the beginning of 

Also notice that, although you find 27C256s in the schematic, pin 1 
can be controlled as well. So one could use 27512s as well. IMHO a 
design usable for other purposes as well.

Have fun!

Kind regards / Met vriendelijke groet, Ruud Baltissen

       Message was sent through the cbm-hackers mailing list
Received on 2013-06-18 18:02:37

Archive generated by hypermail 2.2.0.