PDP-10

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The PDP-10 was a mainframe computer family manufactured and sold by Digital Equipment Corporation from 1967. Its architecture was an almost identical version of the earlier PDP-6 architecture, sharing the same 36-bit word length and slightly extending the instruction set with improved hardware implementation. PDP-10 had 18-bit word addresses, in a so called supervisor mode, instruction addresses correspond directly to physical memory, In user mode, addresses are translated to physical memory. There are 16 general-purpose, 36-bit registers.

The PDP-10 was the foundation of the DECsystem-10 and the DECSYSTEM-20 and ran a variety of operating systems including TOPS-10, ITS, WAITS, TYMCOM-X, TENEX, and TOPS-20. TOPS-10 was the first widely used timesharing system.

=Chess Programs=
 * Leverett CP
 * Mac Hack
 * Paradise
 * Patsoc
 * Schach MV 5,6
 * Tech 2
 * Tyro

=See also=
 * CHEOPS
 * 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
 * Honeywell 6000
 * IBM 7090
 * PDP-1
 * PDP-6
 * PDP-8
 * PDP-11

=Selected Publications=
 * Gordon Bell, Alan Kotok, Thomas N. Hastings, Richard Hill (1978). The Evolution of the DECsystem-10. Communications of the ACM, Vol. 21, No. 1

=Forum Posts=
 * MacHack under PDP-10 emulation by Ian Osgood, CCC, February 03, 2011 » Mac Hack

=External Links=
 * PDP-10 from Wikipedia
 * Programmed Data Processor from Wikipedia
 * DECSYSTEM-20 from Wikipedia
 * The PDP-10 Family, from Gordon Bell's site
 * The Digital Equipment Corporaton PDP-10
 * Joe Smith's PDP-10 page 36 bits forever!
 * Moby Memory by Lawrence J. Krakauer
 * PDP-10 Machine Language » Assembly, MIDAS
 * Phil's PDP10 Miscellany Page
 * Trailing-Edge - PDP-10 software archive
 * LLNL Computer Museum - DEC PDP-10 from The Computer History Museum
 * 36-bit machines from The Computer History Museum
 * PDP-10 Chess from The Computer History Museum
 * PDP-10 Chess from The Computer History Museum

=References=
 * PDP-10 by Ed Thelen
 * PDP-10 · GitHub hosted by Lars Brinkhoff
 * /pdf/dec/pdp10 from bitsavers.org

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