On Friday, 10 August 2018 23:43:22 UTC+1, Bill Findlay  wrote:
> At Glasgow, we year 3 CS undergrads all had COTAN accounts in 1968.

"This paper describes the design and implementation of a software teletype
exchange for a multi‐access service using linked KDF9—PDP8 computers. The
KDF9 can support up to 20 on‐line terminals and the PDP8, in which the
software exchange operates, 
can support 32 terminals. This software operates like an automatic telephone
exchange with a user‐optional waiting queue, and has been used at the
Universities of Glasgow and Liverpool to widen the availability of the
multi‐access system COTAN. 

"At Glasgow, using additionally a hardware exchange, about 50 terminals may
compete for access to COTAN. At Liverpool a set of on‐line terminals has been
specifically provided for undergraduate teaching.

A software teletype exchange
D. A. Jones, N. J. Partington, April/June 1974
https://onlinelibrary.wiley.com/doi/abs/10.1002/spe.4380040209

https://www.cs.bham.ac.uk/about/history/photogallery/

Owain

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