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Remington Rand 409
From Wikipedia, the free encyclopedia
The Remington Rand 409 plug-board programmed punch card calculator, designed in 1949, was sold in two models: the UNIVAC 60 (1952) and the UNIVAC 120 (1953). The model number referred to the number of decimal digits of vacuum tube memory storage provided for data.
The machine was designed in "The Barn", at 33 Highland Ave. in Rowayton, Connecticut, a building that currently houses the Rowayton Public Library and Community Center.
These machines were discontinued when the UNIVAC 1004 was introduced in 1962. About 1000 total had been produced by 1961.
Little more can be said on these machines as UNIVAC destroyed all the records on both the design and production of these machines.
Numbers were fixed point variable length (1 to 10 digits). Arithmetic was done in floating point, but all results were converted to fixed point when stored in memory.
Digits are represented in bi-quinary coded decimal. Each digit of memory storage contained 5 tubes, representing the digits 1, 3, 5, 7, and 9.
| Digit | 1 | 3 | 5 | 7 | 9 |
|---|---|---|---|---|---|
| 0 | |||||
| 1 | * | ||||
| 2 | * | * | |||
| 3 | * | ||||
| 4 | * | * | |||
| 5 | * | ||||
| 6 | * | * | |||
| 7 | * | ||||
| 8 | * | * | |||
| 9 | * |
- Rowayton, Connecticut: Birthplace of the World's First Business Computer
- Rowayton Public Library Website
- Universal Automatic Computer Model 60 A Third Survey of Domestic Electronic Digital Computing Systems Report No. 1115, March 1961 by Martin H. Weik
- Universal Autometic Computer Model 120 A Third Survey of Domestic Electronic Digital Computing Systems Report No. 1115, March 1961 by Martin H. Weik