IBM 702

IBM 702

The IBM 702 ( [http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_2423PH702.html photos] ) was announced September 25, 1953 and withdrawn October 1, 1954, but the first production model was not installed until July 1955. The successor to the 702 in the 700/7000 series was the IBM 705.

The system used electrostatic storage, consisting of 14, 28, 42, 56, or 70 Williams tubes with a capacity of 1000 bits each for the main memory, giving a memory of 2,000 to 10,000 characters of 7 bits each (in increments of 2,000 characters), and 14 Williams tubes with a capacity of 512 bits each for the two 512 character accumulators.

A complete system included the following units:
*IBM 702 Central Processing Unit
*IBM 712 Card Reader
*IBM 756 Card Reader Control Unit
*IBM 717 Printer
*IBM 757 Printer Control Unit
*IBM 722 Card Punch
*IBM 758 Card Punch Control Unit
*IBM 727 Magnetic Tape Unit
*IBM 752 Tape Control Unit
*IBM 732 Magnetic Drum Storage Unit

External links

* [http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP702.html IBM Archives: 702 Data Processing System]
* [http://www.bitsavers.org/pdf/ibm/702/ IBM 702 Documents on bitsavers]
* [http://www.computer50.org/kgill/williams/williams.html The Williams Tube]


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