The PDP-11 was sufficiently popular that many unauthorized PDP-11-compatible minicomputers and microcomputers were produced in Eastern Bloc countries. At least some of these were pin-compatible with DEC's PDP-11s and could share peripherals and system software. These include:

• SM-4, SM-1420, SM-1600, Elektronika BK series, Elektronika 60, Elektronika 85, DVK and UKNC (in the Soviet Union)
• SM-4, SM-1420, IZOT-1016 and peripherals (in Bulgaria).
• SM-1420 (in East Germany)
• Mera (in Poland)
• SM-4 (in Hungary)
• Independent and Coral (in Romania)

[

Operating systems

Several operating systems were available for the PDP-11

From Digital:

• DOS-11
• IAS
• P/OS
• RSX-11
• CAPS-11
• RT-11
• RSTS/E
• Ultrix-11
• DSM-11

From third parties:

• ANDOS
• MK-DOS
• MONECS
• CSI-DOS
• TRIPOS
• MUMPS
• Unix (many versions, including Version 7 Unix, UNIX System III, and 2BSD)
• DEMOS (Soviet Union)
• TSX-Plus
• Fuzzball

[

See also

• SIMH (A multiple minicomputer architecture emulator written in portable C.)

[

Notes

[

References

• pdp11 processor handbook - pdp11/05/10/35/40, Digital Equipment Corporation, 1973 
• pdp11 processor handbook - pdp11/04/34a/44/60/70, Digital Equipment Corporation, 1979 

[

Further reading

• Eckhouse, jr., Richard H. (1979). Microcomputer Systems Organization, Programming and Applications (PDP-11). Englewood Cliffs, New Jersey: Prentice-Hall. ISBN 0-13-583914-9. 

[

External links

• The PDP-11 FAQ
• Preserving the PDP-11 Series of 16-bit minicomputers
• Gordon Bell and Bill Strecker's 1975 paper, What We Learned From the PDP-11
• Further papers and links on Gordon Bell's site.
• The Fuzzball
• On LSI-11, RT-11, Megabytes of Memory and Modula-2/VRS by Günter Dotzel, ModulaWare.com - An article on Modula-2 compiler/linker synergy to overcome the PDP/LSI-11 address space limitations, published in DEC PROFESSIONAL, The Magazine for DEC Users, Professional Press, Spring House, PA. U.S.A., January 1986.

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