peter_at_rittwage.com
Date: 2008-11-24 15:58:39
> I was working on creating a schematic for the WarpSpeed cart, and I am
> struggling to figure out how the cart works. My schematic is at:
>
> www.jimbrain.com/incoming/WarpSpeed
>
> I've placed the original pictures I received in the dir as well. Since
> the original bare PCB scans were not great, I've asked for someone to
> mail me a PCB so I can scan it.
>
> That said, I don't understand the 74LS109 operation. Any thoughts are
> appreciated. I don't need to know per se, but I am very curious.
>
> On the reverse engineering, the designer did a bit of obfuscation in
> order to make board layout easier. The ROM is a 16kB one, with data
> lines and address lines crossed.
>
Does the switch just swap between 2x8k banks for 64 vs. 128 mode? I'm
guessing the GAME/EXROM lines would need to change based on that switch
also to accommodate the 128 mode? I'm not familiar with 128 cartridge
configurations.
-
Pete Rittwage
C64 Preservation Project
http://c64preservation.com
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