[ih] NCP and TCP implementations

Louis Mamakos louie at transsys.com
Sun Jul 26 17:36:56 PDT 2020

On 26 Jul 2020, at 19:25, Barbara Denny via Internet-history wrote:
>  Regarding TCP/IP implementations in different languages, 

In this same topic, while at the University of Maryland, Mike Petry and
myself did an implementation for the UNIVAC/Unisys 1100 series mainframe
computers starting 1980 or 1981.  It executed as a user-mode "batch" run
(with real time scheduling priority) and communicated with other software
running on the same system through a shared memory segment.  It was
implemented in UNIVAC 1100 assembly code and a proprietary systems
programming language called "PLUS", that would look familiar to a Pascal
or even PL/1 programmer.

It eventually grew its external connectivity from synchronous serial
interfaces (talking to a fuzzball) and later a (byte) channel attached
Ethernet interface from Fibronics (K200 and K320 if I recall.)

Good times.  36-bit, word addressable CPU with 1's complement arithmetic..


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