IBM 726

IBM 726

The IBM 726 dual magnetic tape reader/recorder for the IBM 701 was announced on May 21, 1952. Unlike later IBM 7 track drives, the 726 could read backwards as well as forwards.

The tape had seven parallel tracks, six for data (called a "copy group", not a character) and one to maintain parity. Tapes were recorded in odd parity, to ensure at least one bit transition percopy group as well as for error checking.

External links

* [http://www-03.ibm.com/ibm/history/exhibits/701/701_1415bx26.html IBM 726 Magnetic tape reader/recorder]
* [http://www.research.ibm.com/journal/rd/255/ibmrd2505ZD.pdf Innovations in the Design of Magnetic Tape Subsystems] (PDF)


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