On 2020-06-18 3:34 p.m., Chuck Guzis via cctalk wrote:
On 6/18/20 6:06 AM, Peter Coghlan via cctalk wrote:
and I also have two Nokia DS 60100 baseband modems, one with a V.35
interface card and one with an X.21 interface card. When I hook up the
former with the BC19F cable, I can get the lights on the modem to react
when I try to access ZSA0: on the MicroVAX. However, I can't get any
reaction when I use the BC19C cable with the latter even when I jumper
the modem to take account of the fewer signals available in X.21. It
may be that the BC19C is meant for something other than the DSH/T32...
Anyway, this whole line of attack is fairly academic as the modems can
only do 48kbps - 160kbps and the maximum for the DSH/T32 seems to be
19200bps.
We would have been delighted to get 19.2K on our 11/750. Leased line
with a Bell 209 modem, 9600 sync. Back then, that ran about $5K/month
for the hookup.
--Chuck
When I started out in customer service many years ago anything faster
than 9600 was very rare and even then they where often split off using
stat muxes or multi-drop lines. I call one store have a 9600 line back
to head office in Toronto that served two store controllers, four 3777s
with 3203 to print orders, one with a tape drive to transmit orders
entered on a Nixdorf mini, as well as some miscellaneous terminals in
the local warehouse and order office. It was not uncommon for users of
3270 terminals to have the controllers in a few offices sharing a
multi-drop line, the banks did the same thing with their terminal
controllers and ATMs.
I also remember some data centers having conditioned dial-up lines that
included a handset that you could talk on, but it was pretty weird as
the conditioned lines did not have echo suppressors.
The first banking terminal I worked on where on a multi-drop 300 baud
async line and I also worked on finance company terminals that where on
a multi-drop telegraph line at a speedy 75 baud.
Paul.
