IBM 3505

IBM 3505 and IBM 3525
TypePunched card reader and controller (3505)
Punched card reader/punch (3525)
Release date1971 (1971)
PredecessorIBM 2540

The IBM 3505 is a reader for 80-column punched cards. It can read cards punched in EBCDIC or column binary at up to 1200 cards per minute (CPM). The IBM 3525 is a multi-function punched card device, capable of reading, punching, and printing on punched cards. The 3505 contains an integrated control unit that attaches to a System/370 byte multiplexer, selector, or block multiplexer channel. An optional feature of the 3505 allows the control unit to also control a 3525, although the two are separately-addressed devices.

The 3505/3525 units attach to a System/370 Model 135 and up, or to a System/360 Model 195.

The 3505 and 3525 were developed at the IBM General Systems Division in Rochester, Minnesota in 1971.

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