4 Apr
2011
4 Apr
'11
2:50 p.m.
Ethan,
Over in the Yahoo group for the HP2000, some questions have been raised
about implementing this feature of the OS under simulation (SIMH) to connect
multiple simulated systems together.
If we were to simulate the sync interface card with a TCP connection
standing in for the modems, it would be nice to make it compatible with
other TCP simulations of 2780/3780, if any should exist.
The HP2000 (Access) was used as an interactive front end for batch systems
such as IBM and CDC in addition to native HP2000 to HP2000 communications,
all using 2780/3780 and sometimes HASP too.
Thanks for asking,
Mike
On Mon, Apr 4, 2011 at 5:17 PM, Ethan Dicks <ethan.dicks at gmail.com> wrote:
On Mon, Apr 4, 2011 at 4:16 PM, Michael Gemeny
<mgemeny at pgcps.org> wrote:
A question about IBM 2780/3780 over TCP/IP for
systems under simulation.
Are their any examples of this in use now?
In commercial use? Probably. 2780/3780 was blessed for moving EDI
traffic a long time ago (c. 1990) - originally, it was dial-up sync
modems, but when the Internet became the dominant transport layer,
folks just bundled up the original protocol in TCP wrappers.
A write up of the implementation would be great
if anyone has that, but
that
may be asking too much.
Are you trying to learn more about the original 2780/3780 bisync
protocol or specifically about how it's encapsulated for transport via
TCP?
I ask because I used to manufacture bisync-emulating devices (HASP and
3780) and have a bit of experience at the low level. I have not
worked with it since modems fell out of favor, so I have nothing to
share about encapsulation.
-ethan