raspberry pi pico - interfacing with ps2 keyboard with pio
Channel: Brenden Adamczak
Date: 2022-08-28

code
https://gist.github.com/brendena/e101b02e69f24d86f0360766e896a332

Resources
PS2 protocol  - 
http://www.burtonsys.com/ps2_chapweske.htm
https://www.avrfreaks.net/sites/default/files/PS2%20Keyboard.pdf
http://www-ug.eecg.toronto.edu/msl/nios_devices/datasheets/PS2%20Keyboard%20Protocol.htm
cool ps2 project 
http://www.lucadavidian.com/2017/11/15/interfacing-ps2-keyboard-to-a-microcontroller/
code taken for ps2 conversion table
https://github.com/tvlad1234/pico-ps2Driv



0:00 - overview of ps2
2:16 - board layout
2:50 - signals on a scope
8:09 - look at code PIO
11:40 - c code