IBM 360 Operating Systems Release History
OS/360
Release 1 PCP Pre-release in
11/??/1965
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12/??/1965
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03/31/1966
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08/18/1966
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08/18/1966
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04/29/1966
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12/07/1966
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Release 12 MVT?, source resequenced
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08/08/1967
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Release 13 MVT
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08/??/1967
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08/30/1968
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Release 17
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(R19.6 + 3 months)
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Release 18 SMF for MVT
Announce:
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07/??/1969
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Availability:
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Currency:
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R20.6 + 3 months
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Release 18.6
Announce:
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10/??/1969
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Availability:
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Currency:
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(R20.6 + 3 months)
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Release 19.1 SMF for MFT, MFT Attach, 1285/87/88 support
Announce:
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06/01/1970
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Availability:
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08/05/1970
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Currency:
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(R21.6 + 3 months)
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Release 19.6 Update (PTF) release
Announce:
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08/05/1970
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Availability:
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(R19.1 + 3-5 months
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Currency:
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(R21.6 + 3 months)
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Release 20.1
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02/??/1971
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Release 20.6 Update (PTF) release
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Release 21
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Release 21.8
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08/??/1972
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