ZX81 USB Keyboard Schematics

This is an old post, preserved for reference.

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Following up my previous posts about the ZX81 USB keyboard, I've been trying out Fritzing to do the layouts, so here are a couple of schematics. This is the initial testing with a couple of rows of switches:

This is the complete circuit with the 8 pin row connector and 5 pin header connector.

This is a schematic - I haven't figured how to get the lines straight - better read the manual!

ZX81 USB Keyboard by Dave Curran is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License.