30 Sep
2015
30 Sep
'15
9:17 p.m.
I couldn't spot how they did level shifting to RS232 levels. The SI
signal appears to go to a 7400 next to one of the Uarts.
One of the Uarts is one which requires it would seem 12 v as well, but
it doesn't do the levels for rs232 (AY-3-1015)
I'd need sharper images and possession of the board to peer at it for an
hour or so to try to figure it out.
Also the edge card space from the dual 50 pin headers seem to be
suspicious. i don't have an S100 spec to look at handy, but I was going
to see if there is any decoding going on, or maybe this is just a buffer
board to go to another system. There seems to be a lot of LS244 and so
forth going on on the way to the edge card connectors, which smells more
like a buffer board than a serial board. that is is not populated but
for the two 10 pin connectors is more interesting.
Maybe someone else will figure out more or know more.
thanks
Jim
On 9/30/2015 6:22 PM, drlegendre . wrote:
In fact, I did not. Thanks for the tip! ;-)
On Wed, Sep 30, 2015 at 8:18 PM, william degnan <billdegnan at gmail.com>
wrote:
Did you try asking @ retrotechnology.com
Bill Degnan
twitter: billdeg
vintagecomputer.net
On Sep 30, 2015 8:52 PM, "drlegendre ." <drlegendre at gmail.com> 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:
>
> https://nerp.net/~legendre/altair/mct_serial_01.jpg
> https://nerp.net/~legendre/altair/mct_serial_02.jpg
>
> 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
> 
