The macro came in with R20.1 but the field was older. <http://bitsavers.org/pdf/ibm/360/os/R19_Jun70/GC28-6628-5_System_Control_Blocks_Rel_19_Jun70.pdf>
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי נֵ֣צַח יִשְׂרָאֵ֔ל לֹ֥א יְשַׁקֵּ֖ר ________________________________________ From: IBM Mainframe Discussion List <[email protected]> on behalf of Charles Mills <[email protected]> Sent: Friday, February 21, 2025 7:50 PM To: [email protected] Subject: Re: Mystery TCBOTC text in Data Areas External Message: Use Caution Did IKJTCB even exist before there was TSO? Charles On Fri, 21 Feb 2025 18:13:05 +0000, Seymour J Metz <[email protected]> wrote: >That text may have made sense for OS/360 R1. It certainly didn't make sense in >1968. ---------------------------------------------------------------------- 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
