ard at p850ug1.demon.co.uk
Sat Feb 3 19:00:56 CST 2007
> Anyone hacked their Z-80 with a analog meter yet? Seems the easiest
> (just pull off of the M1 line).
What happenms with the 'repeat' instructions, LDIR, etc? I seem to
remember they keep on re-fetching the opcode, do they assert M1 each time?
I'll do it for the HP98x0 (decode one of the states in the 'instruction
fetch' microcode routine from the microcode PC lines available on the
text connector on the CPU cotnrol PCB, then integrate the output.
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