I always thought that z/OS 1.6 and higher only ran 64 bit. 1.5 and below could run either. That said, I believe that the hardware you are running on determines whether 1.5 and below runs in 31 or 64 bit. I know we had z/OS 1.2 when I worked at P&H, and at that time I learned what all of the rules were. Since we had a MP3000, which was 31 bit addressing, we couldn't go beyond z/OS 1.5. As soon as you went to a z900 or z800 processor, you automatically ran in 64 bit mode, and you had to run z/OS 1.1 and above.
-- Eric Bielefeld Systems Programmer IBM MVS Technical Services Dubuque, Iowa 563-845-4363 ---- Ted MacNEIL <[email protected]> wrote: > >I am very certain that my Z/OS is running in 64 bit mode > but how can I confirm > > If it's 1.7, or higher, the answer is: "it is". > > z/OS 1.7+ only runs in 64-bit. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
