Model M Type C

This is a project with the simple goal of recreating the old IBM Model M keyboard controller with modern technologies in mind.

Motivation

Although the IBM Model M is perhaps the most well-known and popular of old keyboards, it isn't equipped with some modern ameneties we have grown used to enjoying. Key features that the Model M lacks are Windows and Media keys(or, broader, firmware-level repogramability), as well as a hotswappable connection with a modern interface. This controller is designed to bring 21st century features to a 20th century keyboard.

Goals

• Native USB C
• Hotswappable
• Fully configurable with QMK compatibility
• Less power draw
• Complete reversability

Usage

Note: If your Model M has two ribbon cables with a 16-12 split rather than the three connectors with 16-8-4 split, see this issue.

1. Print the board either using a cheap foreign service such as JLCPBC for around $6 + shipping, or a domestic service such as OSH Park for around $35. Someone also seems to be selling a PCB for this on eBay, which is totally a scam for $47.95. Does make me feel flattered, though.
2. Order the components- part list from Digikey. USB-C port needs to be bought elsewhere, I recommend here. $15 total for components. If your LEDs connect via a ribbon, get this instead of the JST 4 pin connector. I used this cable as a riser cable to connect the controller's USB C port to the side of the keyboard. Unfortunately, due to size conflicts, this cannot be done without a riser cable if you want the external usb c cable to be detachable. This brings total component cost to $25 without shipping.
3. Put it together. It's possible to solder these SMD components manually with a soldering iron, but if you are able to find a hot air gun or a reflow oven, it'll be significantly easier. Reference the visual BOM to see what goes where.