Hey, wait!

A project log for CP297s

ZX97 plus AY sound on a CP200s case

danjovicdanjovic 08/08/2019 at 03:100 Comments

I have found one issue with the original ZX97 lite schematic: The /WAIT line is connected to an ordinary output pin rather than an Open Collector.

A peripheral device  (like my keyboard adapter ) would fail to bring down the /WAIT line to hold the Z80.

I have fixed that on my design with a diode and a pull up resistor