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<!-- Image with disputed fair-use status removed: -->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:

The CPC-II Calculator had the following machines interconnected by cables:

From the IBM Archives:<blockquote>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 composing 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...
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