@thomasfuchs imagine getting a circuit diagram with your computer. Which you had to build yourself.
@GrantMeStrength @thomasfuchs Is that an S-100 board?
@GrantMeStrength @thomasfuchs One of my first jobs was removing voltage regulators from some S-100 cards so they could be used in a machine with switch mode PSU (+/-12V and +5V, probably from Weir) instead of the old linear (+/-16V and +8V?).