MS11B, MS11B+, TDEx and IMX400 Old Boys

Over the years there were many people involved in the development of this software.

What was it? Who was involved?

• What was TDEx?

Basically TDEx was a "store and forward message switch". It was supplied as a complete turnkey system - software and hardware - to telecoms operators and corporations around Europe. It started life at the end of the 1970's. It was designed to run on Digital PDPs - essentially this meant the PDP-11 range, written in Coral-66 and Macro-11. It was able to handle over 190 asynchronous communications lines (we did one that was 192). It could also handle synchronous connections - X.25 and IBM 2780/3780. it could also handle direct connection to telex lines, PSTN, telegraph circuits and those modern modems (300 bps was good at the start). Towards the end of its development life it also supported outbound fax.

Formatted messages wouuld come in and go out without intervention - with automatic format, protocol and speed conversion. At the time of writing this section (August 1999) it is still live at a couple of sites and is handling tens of thousands of messages per day.

• What was IMX400?

Next generation on from TDEx - in a way - while not as flexble, it was undertaking a complex task.

It was an X.400 MTA and Message Store written in 'C' for Vax/VMS. Sold to service providers and corporates. It was also partnerd by a complete X.400 user agent (PCX400). One of the few implementations of the P3 protocol - since it pre-dated the 1988 X.400 P7 definitions.

As time moved on, it became more complex, featuring gateways to fax, Kermit and to TDEx (above). Its flexibility was demonstarted by implementing both outbound and inbound fax.

• Who was involved?

If you were involved, but cannot find yourself in the list or if you are on the list and want to get off it then .. please send me a note

Ah memories ... PDP-11 Newsgroup ... PDP-11 emulator

paul@spidersweb.freeserve.co.uk

Many of the people have kept in touch and are contactable through this list
MSGING-OB@yahoogroups.com

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