4 ms·

Thought the source code is not IP bounded and that is why we can run mvs older edition with the ibm emulator. Software as busy is mainly bill gates idea. Cont

Thought the source code is not IP bounded and that is why we can run mvs older edition with the ibm emulator. Software as busy is mainly bill gates idea. Control the hardware (like ps2 ...) you have the castle is the mentality of yesterday year. Or meter the punch card (the first anti-trust case against ibm?).

skissane 5y ago
> Thought the source code is not IP bounded and that is why we can run mvs older edition with the ibm emulator. In the beginning (1960s), IBM released their mainframe operating systems into the public domain. (At the time, US copyright law required an explicit copyright notice, and so IBM relinquished their copyright by publishing the software without any copyright notice attached.) So they were not copyrighted and anyone was free to use them, both then and today. In the 1970s, IBM began to increasingly copyright add-on components, but left the core OS public domain. However, a lot of new features went into those copyrighted add-ons (MVS/SE, MVS/SP, ACF/TCAM, ACF/VTAM, TSO/E, SPF, etc), so if you just stuck to the public domain core OS you were running something a lot more limited than what you got with all of IBM's copyrighted add-ons. Finally, starting in the 1980s, IBM started copyrighting the core OS as well. The big change was the introduction of MVS/XA in 1983 – MVS/XA supported 31-bit addressing (as opposed to the 24-bit addressing of previous versions). MVS/XA was fully copyrighted, both core and extensions. So, yes, you can run old public domain OS versions legally, but not current versions. For example, the newest version of MVS you can run is MVS 3.8J at 8505 maintenance level. That has bug fixes through to 1985, but in terms of actual features is stuck somewhere in the early-to-mid 1970s. (The story for VM/CMS and DOS/360 is similar.)

4 ms·

Thought the source code is not IP bounded and that is why we can run mvs older edition with the ibm emulator. Software as busy is mainly bill gates idea. Cont

by ngcc_hk 5y ago

skissane 5y ago
> Thought the source code is not IP bounded and that is why we can run mvs older edition with the ibm emulator. In the beginning (1960s), IBM released their mainframe operating systems into the public domain. (At the time, US copyright law required an explicit copyright notice, and so IBM relinquished their copyright by publishing the software without any copyright notice attached.) So they were not copyrighted and anyone was free to use them, both then and today. In the 1970s, IBM began to increasingly copyright add-on components, but left the core OS public domain. However, a lot of new features went into those copyrighted add-ons (MVS/SE, MVS/SP, ACF/TCAM, ACF/VTAM, TSO/E, SPF, etc), so if you just stuck to the public domain core OS you were running something a lot more limited than what you got with all of IBM's copyrighted add-ons. Finally, starting in the 1980s, IBM started copyrighting the core OS as well. The big change was the introduction of MVS/XA in 1983 – MVS/XA supported 31-bit addressing (as opposed to the 24-bit addressing of previous versions). MVS/XA was fully copyrighted, both core and extensions. So, yes, you can run old public domain OS versions legally, but not current versions. For example, the newest version of MVS you can run is MVS 3.8J at 8505 maintenance level. That has bug fixes through to 1985, but in terms of actual features is stuck somewhere in the early-to-mid 1970s. (The story for VM/CMS and DOS/360 is similar.)