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NeXT
October 14th, 2009, 05:13 PM
I saw a pile of these in varying shape (most were either incomplete or were hacked and whacked into doing things they were never designed to do) and so I quickly cobbled one complete unit together and took it home with me from the university recycling pile.
From what I can see, it's an 8080A-based Single board trainer and that's pretty much it.
There is a bit of valueable info here (http://www.decodesystems.com/mmd1.html) as well as a pic of the awesome looking experimental board (http://www.computermuseumgroningen.nl/monoboards/mmd2.jpg) you could get for it.
I'm a total n00b when it comes to stuff like this. Would any further documentation be available?

saundby
October 16th, 2009, 03:12 AM
The Bugbooks are online now at:

http://www.bbookhistory.com/
The latest ones are experiment manuals for the MMD-1.

I have a book that was a third party experiment manual for it, I've got a cover scan and a bit of comment on it here:
http://saundby.com/electronics/8085/bibliography.shtml

Slide down the page to the green and blue book, 8080 Microcomputer Experiments, by Howard Boyet, Dilithium Press.

The MMD-1 was a neat system. It was a product of its time, it did a lot with what was available when it was designed, and with the cost constraints on it.

Any more waiting to be rescued from disposal/destruction at your uni? ;)

NeXT
October 18th, 2009, 12:12 AM
Thanks for the documentation.
There were a few others but after at least ten years of use they were either very worn out or were incomplete (chips missing, circuits rewired and generally they were not worth saving unfortunately). I doubt they are still there now as the packrats in the electronics/robotics division like to clean the skids off after class.

saundby
October 18th, 2009, 11:36 PM
Probably just as well they got cleaned out, for my sake I'm really pleased you've got one in good shape.

It wouldn't be too hard to build up an MMD-1 from parts today, but with the much better selection of parts available today there isn't much reason to, even if the objective is an 8080A trainer.

As a side note, I was very surprised recently when I picked up one of the NTE parts catalogs at our local Fry's Electronics and found that the 8080A and support chips (e.g. bus demux and clock generator) are current parts they carry.