That's the sort of question I would have answered by consulting the logic manuals, back when IBM condescended to publish them. I would guess a PC to a routine that may or may not schedule an SRB, depending on the nature of the request.
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Apoorva <[email protected]> Sent: Wednesday, January 8, 2020 11:09 AM To: [email protected] Subject: SVC 26 Hello, When SVC 26 is invoked, I believe it communicates with the CATALOG address space to either read from Catalog or write into Catalog? If this is true, I would like to understand how SVC 26 communicates with CATALOG address space? Is it either through POST/WAIT logic or through PC interface (or some other way)? In order to understand this I took a SLIP dump right after SVC 26 invocation, in one of my test programs, and tried to read the SYSTRACE entries, in the dump, in between "SVC 1A" and "SVCR 1A" but I didn't get a clue on how communication may happen (if at all it happens). Thanks, Apoorva ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
