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 Message was sent through the cbm-hackers mailing list
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