Posts Tagged ‘sharing’:

2021-12-21 RS-232 Sharing Box, RS-485, Poll-Select, Etc.

I had hundreds of CRT terminals around campus, connected to 16 RS-232 ports on the mainframe computer, back in the ’80s and ’90s. The protocol was Burroughs poll-select. Each of a dozen or so terminals was given its own address by dip switch. They were all running at 9600 bps over telephone lines driven by

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