Arty computers

Tony Duell 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.

-tony



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