This video from Larry Ramsey (used with permission).
Shows the cold startup of a Unisys A6 system running Unisys MCP. The connected terminal is a Unisys T27.
The Unisys A1, A4, A6 and System 80/7E were essentially the same base hardware with dual SCAMP processors. System 80 runs OS/3 but with different microcode loaded onto SCAMP (Single-Chip-A-series-Mainframe-Processor).
I collect old Unisys machines from anywhere on the planet, so if anyone has one please email me nw@retroComputingTasmania.com
Cool
Duwu772 1 week ago