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!
https://electrickery.hosting.philpem.me.uk/comp/mpf1/doc/MPF-1_experimentManual.pdf
Good to know that I didn't get fake chips this time - I was skeptical, because they look like new. Phew!
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