DFUS – Hayes data modem link and a four-way switch, presumably allowing multiple workstations to share the modem but only one at a time.
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See full size image Caption: DFUS - Hayes modem and a 4-way switch Description: DFUS - Hayes data modem link and a four-way switch, presumably allowing multiple workstations to share the modem but only one at a time. Alt text: DFUS - Hayes modem and a 4-way switch Image credit: © Crown Copyright. All rights reserved. Photo subject date: |