4K is indeed an architected limit for MVCOS, but for MVCLE it's "CPU-determined number of bytes".
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 ________________________________________ From: IBM Mainframe Assembler List [ASSEMBLER-LIST@LISTSERV.UGA.EDU] on behalf of Pieter Wiid [pw...@mweb.co.za] Sent: Wednesday, October 21, 2020 2:22 AM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: Re: Conditional MVCL macro? MVCOS? Also needs to be re-driven after 4K