Thanks for the input, gents.. Sigh.. and here I sit, yet again, with neither a logic analyzer nor a decent digital scope. Unless something comes up, looks like I'll have to do it the hard way, as usual - heh.
At least the machine doesn't have a totally scrambled brain, with the correct CPU - so it will be easier to work through things, as I can at least partially communicate with the hardware if needed. Well, except for the lack of bootable media.. Anyone have a spare Z-80? Or some bootable media for the Osborne 1? I have a few CP/M machines here, but I don't think any of them can write media for the Osborne. Even so, I'd need a way to get the Oz disk images to the machine of choice.. and that's another huge hurdle. Help a brother out.. I need some bootstrap media!! ;-) On Mon, Aug 17, 2015 at 12:13 AM, tony duell <a...@p850ug1.demon.co.uk> wrote: > [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 >
