KEYBOARD/4A-99

Name: KEYBOARD/4A-99
SKU: 34539
Price: 10.00 USD
Availability: InStock

TI-99/4A Mitsumi Keyboard Cherry MX upgrade kit

Designed by Troy Schrapel in Australia

2025-07-01T07:03:12.760Z-key-adapter-kit.jpg

2025-07-01T07:03:12.760Z-key-mountingr-kit.jpg

2025-07-01T07:03:12.760Z-key-full-kit.jpg

2024-05-06T01:32:51.372Z-image.png.6b6eb2adae8538701d6c5892af9882a2.png

2024-05-06T01:32:51.372Z-image.png.1c3c26ad6c65799bb48f5da76674d9ce.png

2024-05-06T01:32:51.372Z-image.png.6deccc0caf2b5cee194b4aead53abc74.png

Buy with confidence.

Our Tindie Guarantee protects your purchase from fraud. Learn More

TI-99/4A Mitsumi Keyboard Cherry MX upgrade kit

What is it? A Cherry MX compatible upgrade for the infamous Mitsumi mylar keyboards that plague many unfortunate Texas Instruments TI-99/4A computers. The full upgrade consists of a new PCB and (opti…

What is it?

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

The full upgrade consists of a new PCB and (optionally) a handful of 3D printed parts. The original look is maintained by re-using the original Mitsumi 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.

Note: This is an upgrade. As such, you will need an original TI-99/4A Mitsumi (or Archer) Keyboard as a donor for these parts:

Key caps
Alpha lock switch
Space bar supports
15p Ribbon cable
Metal support brackets

3D printed parts

If you choose to print your own parts, all STLs are available in the product GitHub page. Alternatively, they can be included with your order as optional add-ons.