Gery shared with me a modification feature in remark-issue38-1983. This is an article from Pat Swayne, where he runs the Heath Z80 CPU at 3 MHZ along with the H17 controller. The H17 is receiving a constant 2MHz signal from the Heath Z80 board. The new Z80 V4.0 supports this feature along with the new H8 Front Panel. However the H17 controller lack such support as the article came to me late. On the H17, I will need to cut a trace and add a wire. A very simple change.
Can you make the changes to HDOS so that when it switches the speed, it loads the correct constants for the H17 to operate, when CPU frequency can be any speed value? I wonder if this is feasible or not.
Attached is the article for your review.
OK, let’s put this idea to rest. 😊
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