Teeprom

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More Pictures

Parts

PCB: https://oshpark.com/shared_projects/EajwlGGE
BOM: https://www.digikey.com/short/pbch8c
Carrier: Shapeways or Sculpteo

Programming

To write the eeprom, you need:

• Programmer such as TL866
• SOIC-28 test clip such as Pomona 5437, AP/3M 923660-28, AP/3M 923665-28
• dip-28 socket
• 28 jumper wires with male pins on one end and female Dupont style sockets on the other end.
• rom image files

Put the female ends of the wires onto the test clip.
Put the male ends of the wires into the dip28 socket.
Put the dip28 socket into the programmer.
Remove the Teeprom from the Model 100/102/200
Clip the test clip onto the chip on the Teeprom module.

Sources

The PCB is maintained on github: http://github.com/bkw777/Teeprom
The carrier is maintained on github: http://github.com/bkw777/pcb2molex8878

If you want to get the carrier printed by another service, get the STL file from the github repo and upload it to any other appropriate service such as Weerg, CraftCloud, etc.

It's important to use the appropriate printing technology for this prt. Currently the only commonly available / practical printing method that is both accurate enough and produces a functionally strong enough part is SLS. Print with any other method at your own risk. Some notes:

Fused Deposition: Essentially not printable by FDM. I have managed to print this on my own FDM printer (Creality CR-10S). It was just barely accurate enough to fit, but too weak.

Stereo Lithography: Prints extremely accurately and would fit perfect, but is too fragile.

Multjet Fusion: Not accurate enough. I tried several times from ShapeWays. Looks almost perfect visually, doesn't fit well enough.

Some print services offer extra high resolution options for their SLS printing. Sculpteo offers a 60um option which is about twice as high resolution as normal. This does come out very nice, but isn't necessary. The Standard SLS raw PA12 100-120um from Sculpteo, or the standard/cheapest option from Shapeways, is already perfect.

Some print services offer dye and other post-processing options. Be careful with those as they can change the final fit. Raw nylon with or without dye coloring finish is always fine. Sculpteo also offers some gloss and paint finishes. I have not tried any of those yet. The added layer of paint may possibly cause the part not to fit.