PDP-6

DEC's first 36-bit personal [|mainframe computer] developed and manufactured from 1963, and shipped since 1964, influential for the later PDP-10 with almost identical instruction sets. Addressing remained 18-bit, as in earlier DEC machines, allowing for a 256 Kiword main [|magnetic core memory], optionally with 16 words of fast memory constructed from discrete [|transistor] flip-flops. Output could be displayed on a DEC 340 display.
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 * [[image:flipflop6as.jpg link="http://ljkrakauer.com/LJK/essays/bits.htm"]] ||~  || **PDP-6**, (Programmed Data Processor-6)

Already supporting [|Time-sharing], the operating system used was an early version of what later became [|TOPS-10], and several sites made custom versions of the system, available as source code. The PDP-6 with serial number 2 was donated to MIT's [|Project MAC], where it was used to develop the [|ITS] operating system. Richard Greenblatt et al. developed the Mac Hack VI chess program entirely in MIDAS, the PDP-6 macro assembler. || toc =Photos=
 * PDP-6 Flip-Flop   ||~   ||^   ||

Bell and Kotok

 * [[image:Dec_pdp-6.lg.jpg width="560" link="https://en.wikipedia.org/wiki/File:Dec_pdp-6.lg.jpg"]] ||
 * [|Gordon Bell] and Alan Kotok at PDP-6 in 1964 ||

Robert Q
First tournament game by a computer, Carl Wagner (2190) - Robert Q, January 21, 1967
 * [[image:RobertQ1967.JPG width="560" link="http://news.google.com/newspapers?nid=1928&dat=19670123&id=O2ggAAAAIBAJ&sjid=1GYFAAAAIBAJ&pg=2308,2313204"]] ||
 * [|Allen Moulton] and R. William Gosper operating "Robert Q" on a PDP-6 ||

=See also=
 * HAKMEM 169 to count the ones in a PDP-6/PDP-10 36-bit word
 * HAKMEM 175 by Bill Gosper for Subsets with equal Cardinality
 * IBM 7090
 * Honeywell 6000
 * Mac Hack VI
 * PDP-1
 * PDP-8
 * PDP-10
 * PDP-11

=External Links=
 * [|PDP-6 from Wikipedia]
 * [|Programmed Data Processor from Wikipedia]
 * [|PDP-6] by [|Ed Thelen]
 * [|36-bit Timeline] from The Computer History Museum
 * [|archive.computerhistory.org - /resources/still-image/DEC/PDP-6/] from The Computer History Museum
 * [|archive.computerhistory.org - /resources/text/DEC/pdp-6/] from The Computer History Museum
 * [|PDP-6 arithmetic processor 166 : instruction manual. Volume 1] from The Computer History Museum
 * [|/pdf/dec/pdp6] from [|bitsavers.org]
 * [|Moby Memory] by Lawrence J. Krakauer
 * [|Bits] by Lawrence J. Krakauer
 * [|DSpace@MIT : PDP-6 LISP]
 * [|DSpace@MIT : Incorporating MIDAS Routines into PDP-6 LISP]
 * [|Digital Equipment Corp PDP-6 1964]

=References= =What links here?= include component="backlinks" page="PDP-6" limit="60"
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