Clicking on the links in the table below will reveal a fuller description.
Time Line |
24-Bit Systems |
31-bit Systems |
64-Bit Systems |
New Workloads |
2005 |
|
|
z/OS V1R6 |
z/OS.e V1R6 |
2002 |
|
|
z/OS V1R4 |
z/OS.e V1R4 |
Apr 2002 |
|
|
z/OS V1R3 |
|
Mar 2001 |
|
|
||
1996 |
|
OS/390 V1R1 |
|
|
1988 |
|
|
|
|
1983 |
|
|
|
|
1980 |
MVS/SP |
|
|
|
1979 |
MVS/SE2 |
|
|
|
1977 |
MVS/SE |
|
|
|
1972 |
|
|
|
|
1972 |
|
|
|
|
1967 |
|
|
|
|
1965 |
|
|
|
|
1964 |
|
|
|
The z/OS Pedigree stretches back to the 1960's, with its most recent ancestry being in OS/390 Version 2 Release 10, which ceased to be shopped in December 2002. This extensive pedigree is both the systems main strength and weakness.
It is a strength because many core business applications have evolved over the same time frame and those applications can still run today on z/OS. Conversely, because of its ancestry z/OS is a complex beast, arguably less easy to understand than Open Platform systems, which leads to newer applications being developed on the latter. It is no accident that OS/390 introduced UNIX capability to address this issue, and help integration whilst reducing file transfer costs. Equally significant is the fact that the z/OS.e variant is aimed at just such workloads.
Copyright © KMS-IT Limited 2002