IBM 360

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IBM System/360, a 32-bit mainframe computer system family announced by IBM's 2nd president, [https://en.wikipedia.org/wiki/Thomas_Watson,_Jr. Thomas Watson, Jr.] on April 7, 1964, and delivered between 1965 and 1978. The chief architect of System/360 was Gene Amdahl, the project was managed by Fred Brooks.

=Technology= Early 360 models used Solid Logic Technology. The 360/195 (1971) had ECL integrated circuits for the arithmetic and logic operations in the central processor combined with the 32 KiB high speed buffer memory. Each silicon memory chip was about 0.125 inches square and consisted of 664 transistors and diodes etc. Each memory chip stored 64 bits of data. Two memory chips were mounted on a 0.5 inch ceramic substrate. A typical 360/195 configuration would be a single CPU with 2 MiB core memory, an operator's console with a cathode-ray tube (CRT) display for diagnostics and operator control.

=Architecture= The System/360 had a pipelined architecture with 16 32-bit general-purpose registers, four 64-bit floating-point registers, and 24-bit (16 MiB) byte-addressable interleaved memory of Big-endian byte/word order. Most models used microcode to implement the instruction set. Machine instructions had operators with operands, which could contain register numbers or memory addresses. Binary arithmetic and logical operations are performed as register-to-register and as memory-to-register/register-to-memory as a standard feature, and had 4-bit nibble, 8-bit byte, 16-bit halfword, 32-bit word , 64-bit double word or 128-bit quad word memory operands, or even 2048 byte storage blocks. Five separate units allowed the 360/195 to overlap and process up to seven different operations at the same time. The floating-point unit could handle up to two additions and a multiplication at one time.

=Photos= Mike Alexander at the console of the IBM S/360 Model 67 ca 1969 Installation of the IBM 360/91 at Columbia University in 1969 The machine ran J. Biit at ACM 1970, and CCCP at ACM 1971 Master on the 360/195. Alex Bell, Geoff Lambert, Peter Kent, John Birmingham and John Waldron

=Chess Programs=
 * CCCP
 * COKO III
 * Fischer-Schneider
 * J. Biit
 * Kaissa (ICL 4/70)
 * Master
 * Schach

=See also=
 * IBM 370
 * ICL 4-70

=Selected Publications=
 * David K. Gifford, Alfred Z. Spector (1987). Case Study: IBM’S System/360-370 Architecture. Communications of the ACM, Vol. 30, No. 4, pdf
 * Emerson W. Pugh, Lyle R. Johnson, John H. Palmer (1991). IBM's 360 and Early 370 Systems. The MIT Press

=External Links=

IBM System/360

 * IBM System/360 from Wikipedia
 * History of IBM - 1960–1968: The System/360 era
 * IBM System/360 architecture
 * IBM System/360 Model 67


 * Computer History: IBM 360/370/3090/390 Model Numbers
 * IBM Archives: System/360 Announcement
 * IBM Archives: Mainframes introduction 2
 * IBM Archives: System/360 Model 91


 * IBM System/360 from The Computer History Museum
 * Inside System/360 from The Computer History Museum


 * The IBM 360/91 - Columbia University
 * System/360 Model 195 from Chilton Computing, Atlas Computer Laboratory
 * Why won't you DIE? IBM's S/360 and its legacy at 50 by Gavin Clarke, The Register, April 07, 2014

Peripheral

 * IBM 2250 Graphics Display Unit from Wikipedia

Operating Systems

 * BOS/360 from Wikipedia
 * DOS/360 and successors - Wikipedia
 * OS/360 and successors - Wikipedia

Assembly

 * 360 Assembly - Wikibooks
 * IBM Basic assembly language and successors - Wikipedia

Misc

 * Starring the Computer - IBM System/360

=References=

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