RE: UltiMax schematics

From: Bil Herd (
Date: 2008-11-28 12:58:08

Yes, the C64 and C128 have a 'max mode where most of the resources like memory and ROM are disabled.


-----Original Message-----
From: [] On Behalf Of Marko Mäkelä
Sent: Friday, November 28, 2008 3:16 AM
Subject: Re: UltiMax schematics

On Fri, Nov 28, 2008 at 08:27:18AM +0100, wrote:
> Sorry, no offence meant. But AFAIK it is the first time I encountered a
> computer where some internal logic is activated by inserting a
> cartridge.

If homebrew counts and if your definition of "internal logic" covers GPIO,
I have an example: Someone hacked an Atari VCS 2600 to contain a number of
games built-in.  If no cartridge was inserted, you'd choose from the
built-in games.  Cartridges were detected by cutting one of the ground
contacts on the connector.  All known cartridges would connect all ground
contacts together.  If no cartridge is inserted, the cut ground contact
would be floating (or pulled up by a resistor).

That said, I'd like to see evidence too.  Shouldn't the known UltiMax
game cartridges work on a regular C64 as well?


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