IBM 360 Operating Systems Release History
=========================================

OS/360		(source Lehman, "Program Evolution, Processes of Software Change" pg. 45)
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Release 1       PCP  Pre-release in 11/??/1965
Announce:       12/??/1965
Availability:   03/31/1966	14 components, 1152 modules, 400359 source statements

Release 2
Availability:	06/66		14 components

Release 4/5     
Announce:       08/18/1966
Availability:	08/66		17 components

Release 6       MFT
Announce:	04/29/1966
Availability:	10/66		19 components

Release 8      
Announce:
Availability:   12/07/1966	22 components

Release 9.5
Availability	02/1967		29 components

Release 11
Availability:	05/67		34 components

Release 12      MVT?, source resequenced
Announce:
Availability:   08/08/1967
 
Release 13      MVT
Announce:
Availability:   08/??/1967
Manuals:        09/1967

Release 14
Availability	01/1968		35 components

Release 15/16   MFT-II, VTOC positioning
Announce:
Availability:   08/30/1968	40 components, 3819 modules, 1740364 source statements (r16)
Manuals:        05/1968

Release 17
Announce:
Availability:	03/1969		44 components
Manuals:        11/1968

Release 18.0    SMF for MVT
Announce:       07/??/1969
Availability:	09/1969		>48 components
Manuals:        11/1969

Release 18.6   
Announce:       10/??/1969
Availability:

Release 19.0
Availability:	03/1970		>50 components
Manuals:        06/1970

Release 19.1    SMF for MFT, MFT Attach, 1285/87/88 support
Announce:       06/01/1970
Availability:   08/05/1970

Release 19.6    Update (PTF) release
Announce:       08/05/1970
Availability:   

Release 20.0    TSO
Availability:	09/1970		>53 components
Manuals:        01/1971

Release 20.1
Announce:       02/??/1971
Availability:
Manuals:        03/1971, 06/1971

Release 20.6    Update (PTF) release
Announce:
Availability:
Manuals:        09/1971

Release 21.0
Announce:
Availability:
Manuals:        03/1972

Release 21.6
Manuals:

Release 21.7
Manuals:        04/1973

Release 21.8    
Announce:       08/??/1972
Availability:
Manuals:        08/1974

DOS/360
=======

Release 6    
Announce:
Availability:   12/7/1966

Release 20
Manuals:        04/1969

Release 21
Manuals:        11/1969

Release 24
Manuals:        10/1970

Release 28      DOS/VS, CRT console (360/125), IBM Boeblingen
Announce:       1973
Availability:

Release 29      VSAM, 3340 support
Announce:       1974
Availability:

BOS/360
=======

Release 17
Manuals:        07/1968