Hmm, no one able to help?
-------- Forwarded Message --------
Subject: Re: Kaypro Motherboard Add-On Question
Date: Fri, 8 Jan 2016 22:25:39 -0600
From: Jim Brain <brain at jbrain.com>
To: General Discussion: On-Topic and Off-Topic Posts
<cctalk at classiccmp.org>
On 12/12/2015 10:52 AM, Glen Slick wrote:
On Sat, Dec 12, 2015 at 8:32 AM, Jim Brain <brain
at jbrain.com> wrote:
The non soldermask boad on top of the main unit intrigues me. Does anyone
know what it is?
The board says Centram Systems, Inc, Camp Hill, Pa.
There is a marketing blurb in the August 15, 1983 issue of
Computerworld. Don't know if it is for that exact board.
Long ugly link:
Sorry for the delayed update, but after a few relistings, I was able to
secure the PCB for a reasonable price.
It is indeed the board listed on the link, and here is another link:
The product is called "KayNet", a baseband twisted pair CSMA/CD local
network operating at 125kbps. It uses a network called Web, designed by
Centram Systems, Inc. of Camp Hill, PA. The network software , OPSnet,
was written by Aquinas, INc., and is compatible with CP/M 2.2
I secured the board, but it needs to be reverse engineered and I lack
the time at present. Anyone want to take on the effort?
I also need to track down OPSnet OS, and I think there is a bit more to
this board (the documentation I found mentions a switch and an RJ-11
connector. I see what looks like the LED wires on the PCB, and there
are 3 more pins on the PCB that could be the RJ11 pins. There is a wire
that is soldered to U65:pin4 on the motherboard, which I assume is the
switch but maybe hooked to this gate as a way to make the switch a
Here is some documentation:
Here is the KayNET documentation:
(Thanks Jason Scott!)
Anyone interested in bringing this network back to life? I am happy to
design and manufacture replacement PCBs at cost for this...
More on KayNET:
This looks very interesting, but I think I need help to move forward.
brain at jbrain.com