[ih] NCP and TCP implementations

Vint Cerf vint at google.com
Mon Jul 27 05:29:40 PDT 2020



On Sun, Jul 26, 2020 at 8:37 PM Louis Mamakos via Internet-history <
internet-history at elists.isoc.org> wrote:

> 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..
> louie
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