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== References == <references> <ref name="wp">"PDP-11", ''Wikipedia'', [https://en.wikipedia.org/wiki/PDP-11 en.wikipedia.org/wiki/PDP-11]. Announcement in January 1970, the 11/20 as the first model, its $11,800 price, Unix on the 11/20, successors.</ref> <ref name="pl">Digital Equipment Corporation, PDP-11/20 price list, 1 November 1970, p. 2 ([[:File:PDP-11-20 Price List (1 November 1970).pdf]]).</ref> <ref name="sm2">Digital Equipment Corporation, ''PDP-11/20 System Manual'', DEC-11-HR1B-D, sixth printing May 1973, chapter 2, pp. 2-1 to 2-6, Tables 2-2 to 2-8 ([[:File:PDP-11-20 System Manual (DEC-11-HR1B-D).pdf]]).</ref> <ref name="h720">Digital Equipment Corporation, ''H720 Power Supply and Mounting Box Manual'', DEC-11-HR5B-D, fifth printing November 1972, chapter 2, pp. 2-1 to 2-8 ([[:File:H720 Power Supply and Mounting Box Manual (DEC-11-HR5B-D).pdf]]).</ref> <ref name="h720i">DEC, DEC-11-HR5B-D, chapter 4, pp. 4-1 to 4-3. Configurations, environment, power requirements and cabling.</ref> <ref name="h720ds">DEC, DEC-11-HR5B-D, data sheets for models AA/AB and BA/BB (pp. 4-4 to 4-5).</ref> <ref name="ka5">Digital Equipment Corporation, ''KA11 Processor Manual'', DEC-11-HR2B-D, chapter 5, section 5.7, "Multiple Box Systems" ([[:File:KA11 Processor Manual (DEC-11-HR2B-D).pdf]]).</ref> <ref name="drw">Digital Equipment Corporation, ''H720 Power Supply and Mounting Box Engineering Drawings'', 1971, D-CS-H720-0-1 parts list and regulator board schematic D-CS-5408475-0-1 (PDF pp. 10β11) ([[:File:H720 Power Supply and Mounting Box Engineering Drawings (1971).pdf]]).</ref> <ref name="chw">"PDP-11/20", ''Computer History Wiki'', [https://gunkies.org/wiki/PDP-11/20 gunkies.org/wiki/PDP-11/20]. KA11 built without microcode, KE11-A and KT11-B options, RSTS-11.</ref> <ref name="bits">Bitsavers directory [https://bitsavers.org/pdf/dec/pdp11/1120/ bitsavers.org/pdf/dec/pdp11/1120/] (KE11-A extended arithmetic element and KT11-B paging option manuals), retrieved 2 October 2026.</ref> </references> [[Category:Digital Equipment Corporation]]
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