Birtwistle, GrahamHay, BillRitchie, Brian2008-02-272008-02-271981-11-01http://hdl.handle.net/1880/45702This report contains a detailed description of a simulation model of the ring-polling software on Edinburgh University's Cambridge Ring Local Area Network. The model is written in Demos, a Simula-hosted simulation language. The model faithfully reproduces the structure and timings of the current IMP implementation (August 81). A full listing of the model is given as an appendix.EngComputer Scienceunknown1981-71-2310.11575/PRISM/30384