No. z/Architecture, as well as System/360, 370 and 390 have consistently numbered bits from left to right.
You would do well to read, very carefully, https://d.cxcore.net/Eric%20S%20Raymond/How%20To%20Ask%20Questions%20The%20Smart%20Way.pdf -- Tom Marchant On Wed, 20 Sep 2023 07:57:05 -0400, Joseph Reichman <reichman...@gmail.com> wrote: >Bit 0 would be if I did this O R5,=X’00000001’ > >> On Sep 19, 2023, at 9:33 PM, Seymour J Metz <sme...@gmu.edu> wrote: >> >> That's bit 0. >> >> ________________________________________ >> From: IBM Mainframe Discussion List <IBM-MAIN@LISTSERV.UA.EDU> on behalf of >> Joseph Reichman <reichman...@gmail.com> >> Sent: Tuesday, September 19, 2023 9:20 PM >> To: IBM-MAIN@LISTSERV.UA.EDU >> Subject: Re: Why it's important to take Seymour's advice >> >> I have a O R5,=X’80000000’ >> To set bit 31 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
