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ps2-to-xt-adapter

When I bought an ancient IBM 5150 without a keyboard, I first assumed that I could just use one of my old PS/2 keyboards. Well, I learned that this is not true... So I built a small adapter that lets you use a PS/2 keyboard with an IBM 5150 or 5160 (XT) computer. It was a great learning experience :-)

How to build the adapter

Building the adapter is quite simple. All you need is:

  1. a 5-pin DIN 41524 plug
  2. a PS/2 socket
  3. an ATtiny85 microcontroller (optionally with socket)
  4. a prototype board

Solder the PS/2 and DIN 41524 connectors according to the schematics and adapter.fzz

Use the Arduino IDE to build the code and upload it to an ATtiny85.

Files

File Description
capture/* Bunch of protocol captures, captured with saleae Logc 1.2.18
schematics/adapter.fzz schematics for the breadboard in Fritzing
schematics/adapter_bb.png PNG export of breadboard schematics
schematics/adapter_bb.svg SVG export of breadboard schematics
schematics/DIN-Stecker-Pinbelegung-AT-Keyboard.svg XT connector's pinout
schematics/ps2-pcb.svg PS/2 connector's pinout
ps2-to-xt-adapter.ino Code for the actual protocol conversion
ScanCodeMapping.tsv Tab-separated file containg the scan code mapping from XT to PS/2. Collected from all over the internet, most prominently from Adam Chapweske's PS/2 pages
gen_mapping.py Python script that reads ScanCodeMapping.tsv and generates the translation tables used in ps2-to-xt-adapter.ino
README.md This file.