DECSYSTEM-20 [SEP] manufacturer
DECSYSTEM-20
The DECSYSTEM-20 was a 36-bit Digital Equipment Corporation PDP-10 mainframe computer running the TOPS-20 operating system (products introduced in 1977).
PDP-10 computers running the TOPS-10 operating system were labeled "DECsystem-10" as a way of differentiating them from the PDP-11. Later on, those systems running TOPS-20 (on the KL10 PDP-10 processors) were labeled "DECSYSTEM-20" (the block capitals being the result of a lawsuit brought against DEC by Singer, which once made a computer called "system-10"). The DECSYSTEM-20 was sometimes called PDP-20
McNamara, "Computer Engineering: A DEC View of Hardware Systems Design" (Digital Equipment, Bedford, 1979)
- Frank da Cruz, Christine Gianone, The DECSYSTEM-20 at Columbia University 1977–1988
Further reading.
- "Storage Organization and Management in TENEX". Daniel L. Murphy. AFIPS Proceedings, 1972 FJCC.
- "DECsystem-10/DECSYSTEM-20 Processor Reference Manual". 1982.
- "Manuals for DEC 36-bit computers".
- "Introduction to DECSYSTEM-20 Assembly Language Programming" (Ralph E. Gorin,