Encyclopedia > IBM 604

  Article Content

IBM 604

The IBM 604 was a plug-board[?] programmable Electronic Calculating Punch introduced in 1948, and was a machine on which considerable expectations for the future of IBM were pinned and in which a corresponding amount of planning talent was invested.

Most of the circuitry was based on modifications of circuit designs used in the earlier 603[?] Electronic Multiplier and was packaged in small one tube replaceable standardized modules. Clock speed was increased from the 603's rate of 35kHz to 50kHz. It performed fixed point addition, subtraction, multiplication and division using Binary coded decimal. Initial versions supported 40 program steps, but this was soon expanded to 60. Processing was still locked to the reader/punch cycle time, thus program execution had to complete within the time between a card leaving the read station and entering the punch station!

In 1949 a modified version of the 604, connected to an accounting machine, was introduced as the Card Programmed Electronic Calculator[?]. This machine read its program steps from punch cards instead of a plug-board.

External Link

http://ed-thelen.org/comp-hist/IBM-604 (http://ed-thelen.org/comp-hist/IBM-604)

All Wikipedia text is available under the terms of the GNU Free Documentation License

  Search Encyclopedia

Search over one million articles, find something about almost anything!
  Featured Article
Gillian Anderson

... who was reared in England. She is well known for her role as FBI Agent Dana Scully[?] in the American TV series The X-Files. Filmography: The House of Mirth[?] ...