Mainframe, MVS and zOS Discussion

Hi,

My question is perhaps offtopic but this has been haunting me. What is more appropriate to use between OS390 versus zOS? I have seen people are using these terms, usually, interchangibly. Is not it that OS390 is among the initial releases of the operating system? And it's zOS now.

the operating system names change to follow roughly the architecture of the hardware .

have a look at
http://www.demorton.com/Tech/$OSTL.pdf

Is not it that OS390 is among the initial releases of the operating system?

LOL -- completely ignoring MVS/ESA, MVS/XA, MVS, MVT, MFT and so forth. OS/390 did not come along until 1995 and the first IBM mainframe operating system in this line came out in 1964. Operating system names tend to hang around -- if you look at the documentation for z/OS, IBM still has the term MVS in some of the manual titles -- even though MVS came out in 1974 and hasn't been the name of an operating system since OS/390 came out.

Thanks.

I have seen people using MVS also but not MFT or MVT. But as you said, IBM documents still use MVS, perhaps that makes to use it.

MVS also but not MFT or MVT.

because ...
MVS stands for Multiple Virtual Storage

MFT stands for Multiprogramming with a Fixed number of Tasks
MVT stands for Multiprogramming with a Variable number of Tasks