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by SulphurCrested
543 days ago
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The console processor was an LSI-11, a PDP-11 on a chip. It hung off the inside of one of the cabinet doors. It was responsible for booting the 780 and also gave VMS access to its own 8″ floppy drive, which had a habit of overheating. The 750 was later technology, IIRC MOSFET. It also lacked the 780’s “compatibility mode”, which allowed VMS to run 16 bit RSX-11 executables by implementing the PDP-11 instruction set in addition to the 32 bit VAX one, and could boot without a console processor. If you didn’t need all the users on one machine, the 750 was cheaper per user. |
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