A software teletype exchange
Donald A. Jones, N. J. Partington · Software Practice and Experience · 1974
Abstract 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.