Matrix Keyboard PCB

What is it?

A Printed Circuit Board for a matrix keyboard as per the UK101 / Superboard computer.

Why did I make it?

I needed to test compatibility with retro UK101 / Superboard software. Cegmon and BASIC expect to poll a matrix keyboard and read back values. Address decoding is performed on-board at $DF00 for simplicity.

What makes it special?

A very simple, low-cost design — not available elsewhere.

Images