Editing IBM 729 (section)

== Models ==
[[file:Camp Smith, Hawaii. PFC Patricia Barbeau operates a tape-drive on the IBM 729 at Camp Smith. - NARA - 532417.jpg|thumb|PFC Patricia Barbeau operates an IBM 729 at Camp Smith, Hawaii, in 1969]]

* 729 I: The IBM 729 I was introduced for the [[IBM 709]] and [[IBM 705|IBM 705 III]] computers, looked identical to the [[IBM 727]], and used [[vacuum tube]]s. The main improvement was the use of a dual gap head permitting write verify.
* 729 II: The IBM 729 II was introduced for the [[IBM 700/7000 series#IBM 7000 series, transistors, 1960s|IBM 7000 series]] computers, introducing a new cabinet style and [[transistor]]ized circuitry. Supported dual density (200, 556).
* 729 III: High speed (112.5 in/s) single density (556).
* 729 IV: High speed (112.5 in/s) dual density (200, 556).
* 729 V: High density (800).
* 729 VI: High speed (112.6 in/s) high density (800). Introduced September 1961.<ref>[https://web.archive.org/web/20100820215557/http://www-03.ibm.com/ibm/history/exhibits/dpd50/dpd50_chronology2.html DPD chronology]</ref>