Remington edge 409
The Remington Rand 409 was designed in 1949. It was one of the first punch card machines that used tubes to store intermediate results. The machine was built under the names UNIVAC 60 (1952) and UNIVAC 120 (1953). The number in the designation reflected the number of decimal points that were available as memory.
Production of the UNIVAC 60 and UNIVAC 120 was discontinued in 1962 and the models were replaced by the UNIVAC 1004 .
All records of these models were destroyed by Remington Rand.
architecture
Numbers were mapped using fixed point numbers. The length of the number after the decimal point could have a variable length up to a maximum of 10 places. Arithmetic calculations were processed in floating point numbers and then converted into fixed point numbers for storage.
Numbers were shown in the bi-quinary decimal code . Each number in the memory was mapped using 5 vacuum tubes, which represented the states 1, 3, 5, 7 and 9.
| number | 1 | 3 | 5 | 7th | 9 |
|---|---|---|---|---|---|
| 0 | |||||
| 1 | x | ||||
| 2 | x | x | |||
| 3 | x | ||||
| 4th | x | x | |||
| 5 | x | ||||
| 6th | x | x | |||
| 7th | x | ||||
| 8th | x | x | |||
| 9 | x |
See also
Web links
- Rowayton, Connecticut: Birthplace of the World's First Business Computer (Engl.)
- Rowayton Public Library Web site (English).
- Universal Automatic Computer Model 60 A Third Survey of Domestic Electronic Digital Computing Systems Report No. 1115, March 1961 by Martin H. Weik (engl.)
- Universal Automatic Computer Model 120 A Third Survey of Domestic Electronic Digital Computing Systems Report No. 1115, March 1961 by Martin H. Weik (engl.)