Oppolzer - Informatik / Blog

For our site and the modules which we write ourselves (no third party software),
it's zero percent. We started migration to 31-bit in the mid 80s and - like PL/1
- dropped support for 24-bit ASSEMBLER modules at some certain point in time in
the last five years. We only support it for some third party software which we
need absolutely and which our management forces us to use. But this count's for
less than 1 %, given the number of modules or CPU cycles.

Regards, Bernd



Am 19.04.2013 18:31, schrieb E.J.:
> I saw a discussionon IBM-MAINrecently about how many MVS TCBs was "too
> many" MVS TCBs in an address space.
>
> System control blocks like TCB, located in LSQA below 16MB, will likely
> never be moved above 16MB since it's still possible for a 24-bit program
> to load PSATOLD and reference GUPI fields in the TCB.
>
> This got me wondering about just how much AMODE(24) code is still out
> there--not only for z/OS but for other operating systems as well. Any
> ideas? Are most programs still 24-bit? Half of them? Ten percent or less?
>
> --
> E.J.
>