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Re: Speed of AE Z80plus ?



David Wilson wrote:
"Steven N. Hirsch" <shirsch@adelphia.net> writes:


exegete@nunya.biz wrote:
I don't know about "around", but I have 2 or 3 assembled and working boards (out of a total production run of perhaps 20 - can't remember exactly). There are a couple of bare boards, but the problem here is that I don't have the fuse patterns for the PAL/PLD devices. I'm hoping that Rod didn't blow the security links.


Maybe it's time to drag out the device programmer and see if I can read any of them.


What PAL types are they? Registered ones are tricky if secured
but the simpler combinational can be reverse engineered by feeding every
possible input pattern and recording the outputs. Then the equations
can be derived.

At least one of them is a registered PAL, a 20RA8 from memory.