Re: Eagle CAD design and fabrication of C64 & Plus4 cartridges

From: Jim Brain <>
Date: Fri, 9 Dec 2016 01:16:36 -0600
Message-ID: <>
On 12/8/2016 11:02 PM, Clockmeister wrote:
> Alphaworks also did a 16k version 
> with a simple bank switch solution.
> I still have one somewhere. It doesn't look like they still sell it, 
> but might be worth an email.
Feel free to email them (Kaspersky says that URL has a virus, so I 
didn't try to work around it).  I whipped up a 15 minute untested 
design.  Will send to Mark.  I added the 3 high address lines on pads so 
someone can bank switch if they want.

Designing a soft-banking solution requires at least 2 ICs (a latch to 
hold the bank and something to combine IO1, R/W, and Phi2), should be 3 
(the C128 really needs the dual FF clock fixer circuit that Skoe and 
Martin Hoffmann-Vetter designed), and that started to sound like work...

So, it's 2 2764-512 footprints, 3 resistors (for the upper address 
lines), 2 caps, and 2 jumpers.  Seems pretty simple.


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Received on 2016-12-09 08:00:02

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