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Type: Multi-tasking, multi-user, virtual memory
Creator: DEC
Architecture: PDP-10
Date Released: 1976

TOPS-20 is an operating system for the PDP-10, DECSYSTEM-20. It was descended from TENEX, an operating system for a modified version of the earlier KA10 PDP-10; hence its nickname of TWENEX.

Basic Use


TOPS-20 can work with DECnet and with TCP/IP. It was a popular machine on the Internet during its early days (1980s).

MIT added support for Chaos.


How to get this running

TOPS-20 can run under emulation in SIMH, KLH10, and kx10.

External links