Of course, when the M1 line of the Z80 CPU is failing, the Z80 CPU must be replaced!

Of course, when the M1 line of the Z80 CPU is failing, the Z80 CPU must be replaced!
Err, why?

If you are trying to use an interface or expansion that needs a Z80 MPU with a working /M1 line, yes of course.

But if you are not using any expansion or using a simple interface like a joystick interface, then nothing will be connecting to, let alone using the /M1 line. So it’s irrelevant if it’s working or not!

</rant>

Mark

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