[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
