Major hardware upgrade to my MPF-1B - CTC & PIO arrived!

A project log for Exploring the Microprofessor

A journey to explore and better understand the Multitech Microprofessor machines in my retro computer collection

Michael WesselMichael Wessel 01/18/2022 at 23:580 Comments

Looking at my MPF-1B pictures and videos you may have noticed that my MPF-1B didn't have the (optional) Z80 CTC and Z80 PIO installed. They just arrived! Plugged them in and keyed in Experiment 15 from the Experiment Manual: Clock 2 with CTC Interrupt Mode 2, and it worked!

Good to know that I didn't get fake chips this time - I was skeptical, because they look like new. Phew!