IBM 709

709
The IBM 709 was a computer system, initially announced by IBM in January 1957 and first installed during August 1958.wikipedia
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IBM 7090

IBM 709470907094
IBM announced a transistorized version of the 709, called the IBM 7090, in 1958, only a year after the announcement of the 709, thus cutting short the 709's product life.
The IBM 7090 is a second-generation transistorized version of the earlier IBM 709 vacuum tube mainframe computer that was designed for "large-scale scientific and technological applications".

IBM 700/7000 series

IBM 705IBM 7010FAP
The 709 was an improved version of its predecessor, the IBM 704, and was the third of the IBM 700/7000 series of scientific computers.
First machines were the vacuum-tube 704 and 709, followed by the transistorized 7090, 7094, 7094-II, and the lower-cost 7040 and 7044.

IBM 704

704address registerIBM704
The 709 was an improved version of its predecessor, the IBM 704, and was the third of the IBM 700/7000 series of scientific computers.
This behavior persisted in later scientific architecture machines (such as the IBM 709 and IBM 7090) until the IBM 7094.

Emulator

emulationemulatedemulate
An optional hardware emulator executed legacy IBM 704 programs on the IBM 709.
In addition to simulators, IBM had compatibility features on the 709 and 7090, for which it

IBM 711

IBM 712711 Punched Card Readercard reader
Up to three Data Synchronizers can be attached to a 709, each able to control up to 20 IBM 729 tape drives and an IBM 716 alphanumeric line printer, IBM 711 card-reader and 721 card punch.
Later IBM computers that used it were the IBM 704, the IBM 709, and the transistorized IBM 7090 and 7094.

IBM 740

IBM 780
The IBM 740 CRT Recorder was announced in 1954 and used with the IBM 701, IBM 704, and IBM 709 computers to draw vector graphics images, point by point, on 35 mm photographic film (i.e. microfilm).

IBM 729

729tape units
Up to three Data Synchronizers can be attached to a 709, each able to control up to 20 IBM 729 tape drives and an IBM 716 alphanumeric line printer, IBM 711 card-reader and 721 card punch.
The IBM 729 I was introduced for the IBM 709 and IBM 705 III computers, looked identical to the IBM 727, and used vacuum tubes.

IBM 738

The IBM 738 Magnetic Core Storage used on 709 was also a milestone of hybrid technology.
It was also used in the later IBM 709.

Computer

computerscomputer systemdigital computer
The IBM 709 was a computer system, initially announced by IBM in January 1957 and first installed during August 1958.

IBM

International Business MachinesIBM CorporationInternational Business Machines Corporation
The IBM 709 was a computer system, initially announced by IBM in January 1957 and first installed during August 1958.

Addressing mode

indirect addressingconditional executionindirect address
The improvements included overlapped input/output, indirect addressing, and three "convert" instructions which provided support for decimal arithmetic, leading zero suppression, and several other operations.

Decimal

base 10decimal systemdecimal fraction
The improvements included overlapped input/output, indirect addressing, and three "convert" instructions which provided support for decimal arithmetic, leading zero suppression, and several other operations.

36-bit

36-bit word36 bit words36 bits
The 709 had 32,768 words of 36-bit magnetic core memory and could execute 42,000 add or subtract instructions per second.

Magnetic-core memory

core memorymagnetic core memoryferrite core memory
The 709 had 32,768 words of 36-bit magnetic core memory and could execute 42,000 add or subtract instructions per second.

Vacuum tube

vacuum tubestubethermionic valve
The 709 was built using vacuum tubes.

Index register

index registersIndexindex (B) registers
The IBM 709 has a 38-bit accumulator, a 36-bit multiplier quotient register, and three 15-bit index registers whose contents are subtracted from the base address instead of being added to it.

Logical disjunction

ORdisjunctionlogical or
All three index registers can participate in an instruction: the 3-bit tag field in the instruction is a bit map specifying which of the registers participate in the operation, however if more than one index register is specified, their contents are combined by a logical or operation, not addition.

Computer number format

Computer numbering formatssign/magnitude formatcomputer numbering format

IBM 716

IBM 717716716 Alphabetic Printer
Up to three Data Synchronizers can be attached to a 709, each able to control up to 20 IBM 729 tape drives and an IBM 716 alphanumeric line printer, IBM 711 card-reader and 721 card punch.

Drum memory

magnetic drumdrumdrums
Up to two IBM 733 Magnetic Drum units, each with 8,192 words of memory, could be attached independently from the Data Synchronizers.

Booting

bootloaderboot loaderboot
The 709 could initially load programs (boot) from card, tape or drum.