RE: How to design non-trivial cartridges for c-64?

From: Rainer Buchty (
Date: 2007-05-22 15:25:14

On Tue, 22 May 2007, Scott McDonnell wrote:

> Aren't we assuming that only one cartridge at a time is being used?

Can you safely assume that? Think of IDE or CMD interfaces, SuperCPU 
etc. Would you unplug that for the sake of some other peripheral?

> But, yes, it should be possible to decode the $DE00-$DEFF and 
> $DF00-$DFFF addresses even further using a bit more complex circuitry.

Decoding is cheap these days. Just use some GAL or CPLD. It only becomes 
complex if all you have is a bunch of 74138 and 139.

> Of course, this is a bit complex for just a text description, I think 
> and a CPLD would be better suited to handle this.

PnP for the C64... I wonder if something like that is possible without 
breaking too many legacy applications.


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