Technically, you could move, e.g, TCB, RB, above the line, if there were a good enough business case. As a practical matter it would require duplicate pointer fields and a PARMLIB option with a default of below. It would definitely be a *lot* of work.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List [IBM-MAIN@LISTSERV.UA.EDU] on behalf of Peter Relson [rel...@us.ibm.com] Sent: Thursday, April 30, 2020 9:09 AM To: IBM-MAIN@LISTSERV.UA.EDU Subject: Re: S0F9 and SOFD ABENDs and SVC dumps - oh my! <snip> z/OS FORCE did not work </snip> Wanna bet? FORCE,ARM runs in the address space so would have been affected. FORCE does not. <snip> z/OS still is a 24bit operating system with some 31/64bit addressing and instructions as long as under the covers such old mechanisms need to be maintained and taken into account. </snip> Of couse it is, if you change "some" to "most" or even "almost all". That is because our customers demand it. That is why many programs written 40 and 50 years ago still work. Compatibility is the cornerstone of this operating system (and even the machine architecture, particularly for things available to problem state programs). Peter Relson z/OS Core Technology Design ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
