There are only three sizes: legacy, 12 bits, unsigned, 4 Ki byts relative, 16 bits, signed, +/- 32 Ki HW = +/- 64 Ki bytes relative long, 32 bits, signed, +/- 2 Gi HW = +/- 4 Gi bytes
-- Shmuel (Seymour J.) Metz http://mason.gmu.edu/~smetz3 עַם יִשְׂרָאֵל חַי ________________________________________ From: IBM Mainframe Assembler List <ASSEMBLER-LIST@LISTSERV.UGA.EDU> on behalf of Dave Clark <dlcl...@winsupplyinc.com> Sent: Thursday, November 9, 2023 12:54 PM To: ASSEMBLER-LIST@LISTSERV.UGA.EDU Subject: Re: Based vs. Relative (was: Internal Exit Routine Handling) "IBM Mainframe Assembler List" <ASSEMBLER-LIST@LISTSERV.UGA.EDU> wrote on 11/09/2023 12:33:58 PM: > Principles is your friend! Yes, I will be doing some reading. But a few quick answers are helpful. > But in addition to up to 4K, you can actually > do up to +/- 65K. OK, so the "normal" relative jump is the signed, 16-bit variety mentioned (15-bit relative target with left-most bit as the direction). How is that +/- 65K? Wouldn't that be +/- 32K? Or are there actually three varieties -- 16-bit, 32-bit, and the "even longer ones" you hinted at? Sincerely, Dave Clark -- int.ext: 91078 direct: (937) 531-6378 home: (937) 751-3300 Winsupply Group Services 3110 Kettering Boulevard Dayton, Ohio 45439 USA (937) 294-5331 ********************************************************************************************* This email message and any attachments is for use only by the named addressee(s) and may contain confidential, privileged and/or proprietary information. If you have received this message in error, please immediately notify the sender and delete and destroy the message and all copies. All unauthorized direct or indirect use or disclosure of this message is strictly prohibited. No right to confidentiality or privilege is waived or lost by any error in transmission. *********************************************************************************************
