richardlynch3 at tx.rr.com
Sat Mar 24 16:43:45 CDT 2007
On 3/11/07 10:41 AM, "Chuck Guzis" <cclist at sydex.com> wrote:
> My recollection is very foggy as I never had a chance to use one of
> these things, but there were devices (inexpensive) to do this for use
> with printers (at least in one direction) that would not only buffer
> up data to be printed, but also do protocol conversions (parallel-to-
> serial, serial-to-parallel). If someone had a very old Inmac catalog
> from the 80's, I suspect you might find something there.
> There were also devices for sharing terminals on a single port sold
> by Inmac and several other companies.
> Finding one of these devices themselves would be harder as I suspect
> that most have long been discarded as peripheral "junk". In a snap,
> almost any old PC with two serial ports could be programmed to do
> the same thing.
I picked up a few of these devices, unused in the box, with the Xerox Stars
I found recently. They are called the "PCS/2000 Networking Modem" by
Microcom. They are Z-80 based, have 2 independent RS-232 interfaces
allowing communication at different baud rates from 110 to 9600, and provide
Xon/Xoff flow control. Now I just need to convert the current loop on my
ASR-33 to RS-232 so I can try it out.
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