O26 was atext editor named after the IBM model026 keypunch (the first character being an alphabetic "O" rather than numeric "0" due to operating system restrictions). The editor could be run on theCDC 6000 series, and laterCyber-70 and -170 series operator consoles. According tosource codelistings of theSCOPE version of O26, it was written in 1967 by CDC programmers Greg Mansfield and David Cahlander.

An independently developed full screen editor was written in 1967 byEdgar T. Irons andFranz M. Djorup at theInstitute for Defense Analyses to run on aCDC 6600. This editor was described in a later ACM article as operating"from low-cost cathode-ray tube entry and display stations with keyboard and 13 function buttons." The terminals used wereCDC 210 display terminals, specially modified with extra function keys. The IDA editor (name not given in the paper) ran on IDA's homegrowntime-sharing system known asIDA-CRD.^[1][2][3]

• Desktop CYBER Emulator ScreenshotsArchived 2021-05-11 at theWayback Machine
• List of O26 CommandsArchived 2012-09-04 atarchive.today
• comp.sys.cdc newsgroup comment about O26^{[permanent dead link]}

• Control Data Corporation mainframe software
• Text editors

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