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Cherry MX compatible upgrade for your Texas Instruments TI-99/4A Mitsumi mylar keyboard

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KEYBOARD/4A-99

Introduction

Finally! a Cherry MX compatible upgrade for the infamous Mitsumi mylar keyboards that plague many unfortunate Texas Instruments TI-99/4A computers.

The upgrade consists of a new PCB and a handful of 3D printed parts. The original look is maintained by re-using the original key caps (and some other original parts). Add the switches of your choice and you're set! A brand new keyboard for your TI-99/4A.

Only Mitsumi boards?

Currently, the upgrade is designed for the Mitsumi keyboards since their mylar innards gives the most grief to TI-99 users. It is possible other TI-99/4A keyboard brands could be adapted to use this upgrade in the future, hower that would rely on community input.

The hardware

The Gerber file for the KEYBOARD/4A-99 PCB is available in the /pcb directory. I recommend the PCB is ordered in black.

STLs for all 3D printed items are located under /stl.

Note: Not all STLs are required.

Check out the documentation for more details, including a bill of materials and full build process.

Purchasing options

These are now available at:

For those outside the US, you can support the project by purchasing direct from my PCBWay project page.

Thanks

Thanks to PCBWay for supporting this project.

PCBWay

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Licence

All hardware designs and products you can find in this repository is licensed under CERN Open Hardware Licence Version 2 - Weakly Reciprocal

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