IBM CPC

IBM CPC

The IBM Card-Programmed Electronic Calculator or "CPC" was announced by IBM in May 1949. Later that year an improved machine, the CPC-II was also announced.

The original CPC Calculator had the following machines interconnected by cables:
*Electronic Calculating Punch
**IBM 604 with reader/punch unit IBM 521
*Accounting Machine
**IBM 402 or
**IBM 417

The CPC-II Calculator had the following machines interconnected by cables:
*Electronic Calculating Punch
**IBM 605 with punch unit IBM 527
*Accounting Machine
**IBM 407 or
**IBM 412 or
**IBM 418
*"Optional" Auxiliary Storage Unit
**IBM 941

From the IBM Archives [http://www-03.ibm.com/ibm/history/reference/faq_0000000011.html] :

The IBM Card-Programmed Electronic Calculator was announced in May 1949 as a versatile general purpose computer designed to perform any predetermined sequence of arithmetical operations coded on standard 80-column punched cards. It was also capable of selecting and following one of several sequences of instructions as a result of operations already performed, and it could store instructions for self-programmed operation. The Calculator consisted of a Type 605 Electronic Calculating Punch and a Type 412 or 418 Accounting Machine. A Type 941 Auxiliary Storage Unit was available as an optional feature. All units comprising the Calculator were interconnected by flexible cables. If desired, the Type 412 or 418, with or without the Type 941, could be operated independently of the other machines. The Type 605 could be used as a Calculating Punch and the punch unit (Type 527) could be operated as an independent gang punch.

Customer deliveries of the CPC began in late 1949, at which time more than 20 had been ordered by government agencies and laboratories and aircraft manufacturers. Nearly 700 CPC systems were delivered during the first-half of the 1950s.

References

*cite book
last = IBM
title = IBM Card-programmed Electronic Calculator; Model A1 using machine types 412-418, 605, 527, and 941
id = 22-8686-3
date = October, 1954
url = http://bitsavers.org/pdf/ibm/605/22-8686-3_CPCprincOps_Oct54.pdf
*cite conference
first = John W.
last = Sheldon
authorlink =
coauthors = Tatum, Liston
title = The IBM Card-Programmed Electronic Calculator
booktitle = Joint AIEE-IRE Computer Conference
pages = pp.30-36
publisher = American Inst. of Electrical Engineers
date = 10-12 Dec 1951
url = http://www.computerhistory.org/collections/DocumentArchive/Documents/Specific%20computing%20machine%20info/IBM%20CPC/ibm-cpc.html
*cite conference
first = E.A.
last = Barber
title = Cam Design Calculations on the Card Programmed Electronic Calculator
booktitle = Proceedings, Seminar on Scientific Computation November, 1949
pages = 52-57
publisher = IBM
date = 1950
id = 22-8296-0 Includes a 2 page listing "Program Card Codings"
*cite conference
first =
last = Cuthbert Hurd
title = The IBM Card-Programmed Electronic Calculator
booktitle = Proceedings, Seminar on Scientific Computation November, 1949
pages = 37-41
publisher = IBM
date = 1950
id = 22-8296-0
*cite book
last = IBM
title = Proceedings, Computation Seminar August 1951
publisher = IBM
date = 1951
id = 22-8705-0 Many articles about the IBM CPC and 604.

External links

* [http://www.columbia.edu/acis/history/cpc.html Columbia University Computing History: The IBM Card Programmed Calculator]
* [http://www-1.ibm.com/ibm/history/exhibits/space/space_card.html IBM Archives: Card-Programmed Electronic Calculator (CPC)]


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