I doubt that any of the old stuff I have, much of which, incidentally is older than the 21-year-old to which you referred, will run at that 10MHz rate, though I once used an ordinary Z-80A at 12 MHz with a BUNCH of 2147's (that's power-hungry, basement-heating, fast, static RAM). Unfortunately, almost no peripherals would talk to it without half a dozen or so wait-states. That was in a hand-wired application and not in an S-100, where, although you can interface the processor, RAM, and ROM with just a gate or two, the bus interface takes about a hundred. (not really, but quite a few!) If I go the route of hand-wiring something for the S-100, I'll probably use one of the WD1002-series bridge controllers I still have lying about. I once lived for about three years on my earnings from that little daughterboard I made which had the Z-80 and a few (4) TTL MSI and SSI parts on it. It provided an interface to a WD-100x-series HDC or HDC/FDC. That way I don't have to go blind wiring all the parts. At my age, that's a serious consideration. First, though, I'll have to fire up that big, old, chassis with the 8" HDD in it, since, though I had several and have bought several cases of beer with the $$$ I got for the bunches of high-quality scrap aluminum they yielded, I've never actually made one of the old SHUGART 1004's work. It always seemed appealing, since it had exactly 256 cylinders, and if you use 32-byte sectors, they also have exactly 256 bytes. It seems made for the Z-80's OTIR and INIR instructions . . . it's just that the 5.25" drives, for which I was designing controllers at the time, and which had to be bought at the time anyway, were so much easier to interface with the S-100 controllers I already had. (I stole from everyone, an equal opportunity reverse-engineer . . . ) It's spent a couple of winters outdoors now, and I wonder if the fans will even work. I do recall, you couldn't hear the HDD above the fans. About ten years ago, Someone gave me several of the XCOMP STS board pairs, but tuned for 8" rather than 5.25" drives' data rate. I imagine they spent a lot of time in someone's desk drawer, in order to keep the boss from learning he'd paid for yet another item they couldn't use. Those might be interesting to try out. Dick -----Original Message----- From: Allison J Parent <allisonp(a)world.std.com> To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> Date: Thursday, April 01, 1999 5:36 PM Subject: Re: Rebirth of IMSAI fo