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Microdyne S-100 boards?

D

DeltaDon

Veteran Member
Joined
Oct 26, 2016
Messages
898
Location
Dutchess County, New York, USA
I picked up a S-100 project computer with a mainframe chassis labeled "Millie" and the board set from Microdyne.

Boards are well made. There's a Z80 CPU board with 2 serial ports and a 50 pin connector that might be a parallel port ???? don't think for floppies, a 64K dynamic ram board plus a D2 floppy disk controller board with IDC connector. Chassis has two 8" full height floppy drives (didn't see brand yet), is missing the floppy drive cable and the two RS-232 cables from the CPU are about 6' long and not connected to the rear of the chassis.

First search for info on Microdyne/Millie doesn't turn up much. I need a boot disk and utilities if anyone has them or can point be to a source. I've got nada for documentation too. Going blind into trying to bring this back alive.

There's a couple of loose wires coming out of the power supply that need to be traced before thinking of powering it up. Then will need some variac time to make sure the supplies don't pop. Also, does anybody still sell made up twin 8" floppy drive cables with an IDC connector at CPU end? Else, Mouser will be getting searched for correct connectors and some ribbon cable. Ebay and Amazon turn up 8" long 3.5" floppy cables. Not. Where's Radio Shack when you need them? :rolleyes:
 
DeltaDon said:
I still have the set of three Millie boards and am wondering if any European S-100 VCF members have knowledge or manuals that might help me put them to use.
Click to expand...
Why European VCF members in particular?

I bet if you post some pics of your system you will get some responses, everyone loves pics of mystery systems :)
 
Yes, Microbyte. I guess I wrote it down wrong and copied my mistake to the first post. As far as I can see there's no way to edit my old post. I also looked at the CPU board and wrote down the following: "MZ80A-I/O CPU" and "Assy NO 11-10-19" and did a google search for both. MZ80a-I/O came back with a VCF post from 2017: https://forum.vcfed.org/index.php?threads/powering-up-a-30-year-old-s100-system.61581/

Plus a link to that OP's website regarding this board: https://ve7it.cowlug.org/cpm-monitor.html

Other URL's too - still reading some of the stuff myself. It appears Sharp made a device "MZ80A" which is not this board.
 
I suspect that the MicroBYTE boards (I got the brand correct this time!) boards, perhaps the S-100 chassis too, may be the exact same ones on the Plasmo thread. Just a guess. Very well made boards and it's hard to believe they are the only set in existence. But I have other S-100 boards that seem to be unicorns too.
 
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