Re: The ultimate UltiMax cartridge

From: Michał Pleban <>
Date: Tue, 22 Oct 2013 17:42:27 +0200
Message-ID: <>

Steve Gray wrote:

> Sounds great. I wonder if you can try substituting a 32K ram chip.
> It comes in "skinny dip" format which is smaller and might give extra
> room on the board to add another chip to take advantage of it (if feasible)
> I ordered these from ebay:

I have some of these chips, mine are labeled KM68257 but the pinout
should be the same. If they are to be used, a GAL will be beeded instead
of glue logic because extra address decoding is needed. Both these chips
will not fit then - the factor here is their length, not width.

> Do you use any protoyping boards to do development (ie: 8-bit baby,
> vannessa's board, etc). I'd like to use a solderless breadboard to do
> some stuff (like I used on ColourPET), but connected to the cartridge
> port, so something that lets you connect a ribbon from the port to the
> breadboard. Any ideas?

Currently I'm not. For smaller stuff I just solder it on a universal
board. For bigger ones like this, I normally start with a PCB design
first, order a prototype PCB, solder stuff on it, currect anby errors
that are found and go for production PCBs.


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Received on 2013-10-22 16:06:03

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