11 Nov
2003
11 Nov
'03
11:22 p.m.
The board looks similar to the standard "Dual Serial Port". which means it
most
likely is a standard serial interface card. That also leads to the
following, if you
take a standard DB-25 connector with lines to all the pins, and put a 26 pin
header
on the wire, you should find, that the signals for "standard RS-232-C" are
available
at the DB-25 connector pins. Since it is a former Cromemco product (maybe) I
would imagine that the memory is for high speed buffering onboard, the Z-80
and SIO
indicate that it might even be a form of SDLC/HDLC networking card. JAG
Jim
WB2FCN
----- Original Message -----
From: "Ian Primus" <ian_primus(a)yahoo.com>
To: "General Discussion: On-Topic and Off-Topic Posts"
<cctalk(a)classiccmp.org>
Sent: Tuesday, November 11, 2003 8:12 PM
Subject: Re: help identifying S100 board
On Monday, November 10, 2003, at 09:06 PM, Patrick Rigney wrote:
I did some more digging on the internet, and found this:
Cromemco
Was acquired by Dynatech, Inc, Burlington, MA and was renamed DCS
(Dynatech Computer Systems) continuing to produce S100 based systems
into the early 90's before they were shut down.
That would fit with the boards I have, since the copyright date is
1990. I need to sit down and trace out more of the circuits on the
board, but it definitely does seem to be an S100 board. I have tried to
figure out what the two 26 pin headers at the upper left are connected
to, but I can't see under some of the components. They do appear to be
serial ports, but I don't know which pins would contain which signals,
so wiring it up to a terminal might be tricky. Maybe if I look up the
specs on the UART and the 1488/1489 driver pair, I can figure out how
their circuit works, and where I can tap into the signals. Powering the
board shouldn't be a problem, since I can easily tell how the power
regulators are connected. Now, if only I knew what this thing did...
Ian Primus
ian_primus(a)yahoo.com
-----Original Message-----
On Monday, November 10, 2003, at 07:58 PM, Dwight K. Elvey wrote:
Connector offset looks about right though, doesn't it? Didn't a
company
called Dynatech buy Cromemco?
Patrick
Hi
This may not even be a s100 board. The height is wrong. Check
the power leads carefully before plugging into a s100. It
does seem to be a complete single board computer.
Dwight
Yeah, I had thought of that, as the only S100 boards I have seen were
shorter, but then again, I don't have any S100 hardware, so I don't