One more try - Can you ID this S-100 Serial board?

Chris Elmquist chrise at
Thu Oct 1 15:30:28 CDT 2015

I've got another theory regarding drlegendre's board.

I happen to know via out-of-band information that he is here in MN.

There is a company in the Twin Cities called Micro Component Technology
that existed in the 70s, 80s, 90s and still today.

They make handling and test systems for IC fabrication.

I'm willing to bet dollars to donuts or lingonberries to lefse that his
board is a custom job made by the MN MCT and it went into the computer
control of one of their machines from the early 80s.  Something probably
designed in the mid to late 70s.

The logo on the board matches what I remember seeing on their building
in Shoreview ages ago.

I don't think it's the MCT that made PC (as in IBM PC) plugins...


On Thursday (10/01/2015 at 10:14AM -0500), Jay Jaeger wrote:
> I had a look, and it seems to me that there is more going on on this
> board than just serial ports.  It is even possible that the system it
> was in had essentially re-purposed the board to use for a serial ports
> in a way that the original designer did not intend.  That would explain
> the lack of obvious level shifting - it may have been used for TTL level
> serial I/O.
> Also, there are lots more passive components on this board than I would
> expect for a serial interface board.
> A company with these initials made EPROM programmers, though their logo
> was different - but perhaps it changed over time.  Maybe this was a very
> early interface board to one of their very early programmers - and
> perhaps it is missing some of the parts, like connector headers and
> resistor packs, and then was re-purposed.
> On 9/30/2015 7:52 PM, drlegendre . wrote:
> > (Months along, posts to several boards / lists, still no help on this one..
> > so I'm giving it another shot. I'd really like to use this board)
> > 
> > Been trying to no avail to find any info on this 'MCT' S-100 serial card.
> > I'm pretty sure the card works, as it came from a previously-working system
> > - but all documents are missing, and without the info, I have no idea how
> > to put it to use. Photos are here:
> > 
> >
> >
> > 
> > Other than what I believe is an artwork / batch number on the rear, the
> > only marking is "Assy 105510" on the front silk screen. My hunch is that
> > this may have been a fairly generic 'OEM' type card which could have been
> > re-badged and sold under one or more different names. So perhaps the docs
> > exist under a name other than MCT?
> > 
> > Any help greatly appreciated - thanks!
> > 
> > -Bill
> > 

Chris Elmquist

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