From: Jim Brain (brain_at_jbrain.com)
Date: 2008-11-22 05:59:51
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. 64 ROM A0 A0 A1 A1 A2 A10 A3 A2 A4 A3 A5 A11 A6 A4 A7 A9 A8 A5 A9 A8 A10 A6 A11 A7 A12 A13 A13 A12 D0 D3 D1 D2 D2 D4 D3 D1 D4 D0 D5 D5 D6 D6 D7 D7 Jim -- Jim Brain, Brain Innovations (X) firstname.lastname@example.org Dabbling in WWW, Embedded Systems, Old CBM computers, and Good Times! Home: http://www.jbrain.com Message was sent through the cbm-hackers mailing list
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