The 78-key PCBs work: workshop-f7/xwhatsit-cs-compatible-ibm- ... ml#p379976
Update: The standard 66-key PCB works! Thanks again to orihalcon for running a GB for those!
So, so much thanks to wcass, DMA, kuato, orihalcon, and ipreferpie for contributing their work and making this possible!
Github link to design files: https://github.com/emdude/XWhatsit-Comm ... M-3277-PCB
This is something that I've been kicking around for the past couple of months but haven't been able to get around to doing until recently.
Much thanks to wcass and kuato for their help so far, and to lot_lizard for suggesting we figure out some way to convert it many moons ago!
The goal here is just to recreate the PCB/pad card of the full-sized IBM 3277 but with an edge connector so it can accept slip-on Xwhatsit and CommonSense (hopefully at some point!) controllers. It's only relatively straightforward thanks to the previous work of wcass and i$ with the Xtant and FSSK/FEXT projects.
I plan to release all design files into the public domain once I have a working PCB.
The proposed matrix:
The row and column arrangement of early beam spring keyboards are a little obtuse so this redesign will incorporate a layout similar to that of late beam springs and capacitive buckling spring keyboards.
Row and column pad measurements: