Post by John Levine
On VM/370, networking including email used a subsystem called RSCS that worked
using virtual card chutes. You could connect the virtual card punch on one
machine to the virtual reader on another and send a virtual deck of cards through it.
RSCS was a background system that sort of extended the card chutes over a network
to other systems. At some point they added SMTP gateways, dunno when.
San Jose Research put in CSNET PhoneNet gateway fall 1982 (before
internet) ... from long ago and far away.
Date: 10/22/82 14:25:57
To: CSNET mailing list
Subject: CSNET PhoneNet connection functional
The IBM San Jose Research Lab is the first IBM site to be registered on
CSNET (node-id is IBM-SJ), and our link to the PhoneNet relay at
University of Delaware has just become operational! For initial testing
of the link, I would like to have traffic from people who normally use
the ARPANET, and who would be understanding about delays, etc. If you
are such a person, please send me your userid (and nodeid if not on
SJRLVM1), and I'll send instructions on how to use the connection.
People outside the department or without prior usage of of ARPANET may
also register at this time if there is a pressing need, such as being on
a conference program committee, etc. CSNET (Computer Science NETwork)
is funded by NSF, and is an attempt to connect all computer science
research institutions in the U.S. It does not have a physical network of
its own, but rather is a set of common protocols used on top of the
ARPANET (Department of Defense), TeleNet (GTE), and PhoneNet (the
regular phone system). The lowest-cost entry is through PhoneNet, which
only requires the addition of a modem to an existing computer system.
PhoneNet offers only message transfer (off-line, queued, files).
TeleNet and ARPANET in allow higher-speed connections and on-line
network capabilities such as remote file lookup and transfer on-line,
and remote login.
... snip ...
First IBM mainframe tcp/ip product (VM/370) was after mid-80s (including
SMTP support ... internally specific locations had it before) ... in
part before for growing number of unix workstations. I did a REXX exec
("REMAIL") that sat in my mainframe user (w/o terminal) waiting for
incoming email and reformated for SMTP and forwarded to SMTP daemon for
my unix workstation (REMAIL had support for handling a wide variety of
of mainframe email formats, the TCP product SMTP daemon didn't have
support for converting between SMTP and non-SMTP formats). REMAIL was
later picked up and integrated into system function.
NSF funded CSNET (later merges with BITNET)
co-worker at science center was responsible for the internal network
technology also used for the corporate sponsored university BITNET
trivia: communication group fought hard to prevent mainframe TCP/IP
product from shipping (part of their battles against client/server and
distributed computing trying to preserver their dumb terminal
paradigm). When they lost, they changed their tactic and said that since
they had corporate "ownership" of everything that crossed datacenter
walls, tcp/ip product had to be shipped by them. What shipped got
44kbyte/sec aggregate using nearly whole 3090 processor. I then did the
enhancements for RFC1044 and in some tuning test at Cray Research
between Cray and (IBM 370) 4341 got sustained 4341 channel speed
transfers using only modest amount of 4341 processor (something like 500
times improvement in bytes moved per instruction executed).
other trivia: 1/1/1983 great conversion to internetworking protocol,
there were approx. 100 IMP network nodes and 255 connected hosts ...
at the time the internal network (larger than arpanet/internet from
just about beginning until sometime mid/late 80s) was rapidly
approaching 1000. Old post with a list of world wide corporate
locations that added one or more nodes during 1983.
one of the corporate issues was all links leaving IBM bldgs had to be
encrypted ... lots of battles w/governments, especially when links
crossed national boundaries. circa 1985, major link encryptor vendor
claimed that the corporate internal network had at least half
the link ecnryptors in the world.
virtualization experience starting Jan1968, online at home since Mar1970