Simple test for correct operation

A project log for PS/2 keyboard to keyboard matrix

Many vintage computers use a keyboard matrix for input. This solution replaces a missing keyboard with a cheap PS/2 keyboard.

fjkraanfjkraan 11/29/2022 at 17:550 Comments

The board and firmware can be tested from the Arduino IDE, right after programming, requiring only a multi-meter:

The first number is the column, the second the row. The former ranges from 0 to 7, the latter from 0 to F (entry in hex), but only the first eight are wired to the header.