17 Aug
2015
17 Aug
'15
5:13 a.m.
[Replacement Z80 in an Osborne]
What I did learn is that Z-80 were made in CMOS
versions, and the Z84C is
one.
So what did I most likely do, here? Hose the CPU for sure? Collateral
damage on the board? Both / Neither?
Most likely neither (unless you put the CPU in the wrong way round or zapped
something with static -- CMOS _and_ NMOS parts can be damaged that way).
If the CPU is fast enough for the clock speed in that machine then most likely
a CMOS one will work without problems.
My guess is that the missing CPU was not the only fault. You now have a good
CPU but problems elsewhere (clock, ROM, RAM, support logic...). Time to grab
the logic analyser :-)
-tony