[TUHS] Tandem NSK implementation language (was: Happy birthday, John Backus!)

Dr Iain Maoileoin iain at csp-partnership.co.uk
Wed Dec 5 18:16:55 AEST 2018

> On 5 Dec 2018, at 04:48, Paul McJones <paul at mcjones.org> wrote:
>> On Dec 4, 2018, Greg 'groggy' Lehey <grog at lemis.com> wrote:
>> The original Tandem OS (called Guardian at the time) was written in Tandem's TAL (Transaction Application Language, amongst other productions), a vague evolution of HP's SPL that looked more like Algol, starting in about 1974.  That is also the earliest I know of an operating system being implemented entirely in a high level language.
> Most likely the earliest operating system written in a high-level language was the one for the Burroughs B5000 (early 1960s), written in a dialect of Algol 60. Others: Multics, written in PL/1 (starting in mid 1960s), the  operating system for the Berkeley Computer Corporation’s BCC-500, written in BCC SPL (system programming language) (late 1960s), OS6 by Stoy and Strachey, written in BCPL (early 1970s), Xerox Alto OS, written in BCPL (about 1974).

About 1972 the Department of Computer Science at Strathclyde University in Scotland had an operating system implemented on a front-end-processor (Icant remember the make)  that allowed the submission and control of jobs to a “mainframe” - an ICL 1904s.
The operating system was written in STAB - a language initially designed and developed by Professor Andrew Colin - and loosely modelled on BCPL.

My memory is that the FEP was about 12 19” racks, it supported about 15-20 users and did not lose your files terribly often ;-)

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