Editing PDP-11 (section)

=== Unlicensed clones ===
The PDP–11 was sufficiently popular that many unlicensed PDP–11-compatible minicomputers and microcomputers were produced in [[Eastern Bloc]] countries. Some were pin-compatible with the PDP–11 and could use its peripherals and system software. These include:
* [[SM-4]], [[SM-1420]], [[SM-1600]], [[Electronika 100-25]], [[Electronika BK]] series, [[Electronika 60]], [[Electronika 85]], [[DVK]], [[UKNC]], and some models of the [[SM EVM]] series (in the [[Soviet Union]]).
* [[SM-4]], [[SM-1420]], [[IZOT-1016]] and peripherals (in [[Bulgaria]]).
* MERA-60 in [[Poland]].
* SM-1620, SM-1630 (in [[East Germany]]).
* [[SM-4]], TPA-1140,<ref>{{Cite web |title=Múzeum - KFKI TPA 1140 |url=http://hampage.hu/tpa/e_tpa1140.html |access-date=2023-04-30 |website=hampage.hu |archive-date=2023-04-06 |archive-url=https://web.archive.org/web/20230406010424/http://hampage.hu/tpa/e_tpa1140.html |url-status=live }}</ref> TPA-1148,<ref>{{cite web |author=Ákos Varga |url=http://hampage.hu/tpa/e_tpa1148.html |title=TPA-1148 |publisher=Hampage.hu |access-date=2014-04-14 |archive-date=2015-07-12 |archive-url=https://web.archive.org/web/20150712212348/http://hampage.hu/tpa/e_tpa1148.html |url-status=live }}</ref> TPA-11/440<ref>{{cite web |author=Ákos Varga |url=http://hampage.hu/tpa/e_tpa11440.html |title=TPA-11/440 |publisher=Hampage.hu |access-date=2014-04-14 |archive-date=2016-03-03 |archive-url=https://web.archive.org/web/20160303235921/http://hampage.hu/tpa/e_tpa11440.html |url-status=live }}</ref> (in [[Hungary]]).
* SM-4/20, SM {{not a typo|52-11}}, JPR-12R (in Czechoslovakia).
* CalData – Made in US, ran all DEC OSes.<ref>{{cite web |url=http://www.bitsavers.org/pdf/calData/CalData_Brochures_1974.pdf |title=CalData_brochure |access-date=2014-04-14 |archive-date=2012-09-12 |archive-url=https://web.archive.org/web/20120912170014/http://www.bitsavers.org/pdf/calData/CalData_Brochures_1974.pdf |url-status=live }}</ref> The CalData hardware was sufficiently DEC-compatible that CalData memory boards could be used in DEC PDP–11 systems.
* CORAL series (made at [[ICE Felix]] in [[Bucharest]]) and the INDEPENDENT series (made at ITC [[Timișoara]])<ref name="Dragomirescu2003">{{cite book|author=Ion Glodeanu (coord.), Oscar Hoffman, Doina Dragomirescu|title=Actorii sociali ai promovării tehnologiilor, informaţiei şi comunicaţiilor|url=https://books.google.com/books?id=Z2aoVu7XheMC&pg=PA122|year=2003|publisher=Editura Mica Valahie|isbn=978-973-85884-4-8|page=122|language=ro|access-date=2014-04-14}}</ref> running the [[RSX-11M]] operating system (in [[Romania]]). The CORAL series had several models: the CORAL 4001 was roughly equivalent to the PDP–11/04, the CORAL 4011 was a PDP 11/34 clone, while the CORAL 4030 was a PDP–11/44 clone.<ref>{{Cite web |url=http://uknc.narod.ru/Doc/rt11book.txt |title=Archived copy |access-date=2014-02-13 |archive-url=https://web.archive.org/web/20140223131154/http://uknc.narod.ru/Doc/rt11book.txt |archive-date=2014-02-23 |url-status=dead }}</ref> These were used in state-owned companies and in public universities, originally operated with [[punched card]]s, later through video terminals like the Romanian [[DAF-2020]], to teach FORTRAN and Pascal, until replaced by IBM PC compatibles, starting in 1991.
* [[Systime Computers]] models 1000, 3000, 5000 – OEM agreement for sales in the UK and Western Europe, but disputes originated over both intellectual property infringement and indirect sales to the [[Eastern Bloc]].<ref>{{cite news | url=<!--BD https://www.cbronline.com/news/systime_sets_80386_s_series_box_100_user_unix_system/ -->| title=Systime sets 80386 S-series box, 100-user Unix System | work=[[Computergram International]] | publisher=Computer Business Review | date=1 February 1987}}</ref><ref>{{cite news | url=https://books.google.com/books?id=Vzni1LqxEEsC&pg=PA29 | title=Who will tear the Silicon Curtain? | author-first=Mary | author-last=Fagan | magazine=New Scientist | date=24 September 1987 | pages=28–29 }}{{Dead link|date=November 2023 |bot=InternetArchiveBot |fix-attempted=yes }}</ref>