G-20 computer Totally Explained

Everything about G-20 Computer totally explained

The Bendix G-20 Central Processor, Circa 1961
   The G-20 system was a general purpose mainframe, constructed of transistorized modules and core memory. Memory size was 32 bits, plus parity. Up to 32k words of memory could be used. Single and Double precision floating point were allowed, as well a custom scaled format, called Pick-a-Point. A special form of the pick-a-point allowed an integer.
   Memory locations 1 thru 63 were used as index registers. One hundred and ten instructions were in the instruction set. The CPU included integral block I/O and interrupt facilities. Multiply time was 51-63 microseconds, and divide time was 72-84 microseconds.
   A special configuration of the G-20, a dual processor G-21, was used to support campus computing at Carnegie Tech in the 1960's. usually, one CPU handled card-based input, and one handled several ASR-33 teletypes.
   Reference on the G-21 System:
"Design of the G-21 Multi-Processor System," by Jesse Quatse,1965
   Another Feature of the G-21 system was its high speed "Scopes" system - when punch cards or ASR33 teletypes were the common form of I/O, this CRT system allowed for a CRT display of information - and the "SpaceWar" game. Here, each operator saw the other player's ships on his screen. Buttons were used for thrust, spin, and firing missiles. The G-21 would play chess with you, via the teletype.
   The directory system was called AND - Alpha Numeric Directory. The machine was programmed in a dialect of Algol-60 called Algol-20. A special extention allowed the use of G-20 machine language within Algol - WHAT. Another language was GATE - the General Algebraic Translator Extended. It also used IPL-V (Newell's Information Processing Language-5)and Linear IPL-V as well as COMIT, and the assembler THAT. MONITOR was the supervisory program, and the special set of routines was called THEM THINGS.
    the Equipment list, Circa 1965/66:
* CC-11 Real time clock and auxiliary console * CP-11 Central Processor (2) * MM-10 Memory module (1) * MM-11 Memory Module (7) * MM-12 Memory Module, modified to work with display system * PT-10 Paper Tape Unit * DM-11 Disk unit * SE-10 teletype buffer * LP-12 high speed line printer (2) * LP-10 low speed line printer * 3 display consoles, and 1 display controller. * An IBM 1402 card reader/punch was used for batch job submission.
   Reference:
"A Visual Display System Suitable for Time Shared Use," Jesse Quatse, revised, 1966

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