The legacy of bit 0 meaning end of address list is back to the dark mists of the invention of the 360.
But using the high bit for signaling 31-bit addressing mode is much newer. It is used by the hardware, but why would it ever be necessary (not just convenient) in a parameter list? IBM Mainframe Assembler List <ASSEMBLER-LIST@LISTSERV.UGA.EDU> wrote on 08/13/2010 09:25:27 AM: > Yes, the unfortunate overloading of bit zero. Does bit zero on in a > parameter list mean a 31-bit address or the last parameter in variable > length parameter list. A real problem when you don't know how old the > legacy code is that's calling your routines. > Gary weinhold > Data Kinetics. Ltd. ----------------------------------------- The information contained in this communication (including any attachments hereto) is confidential and is intended solely for the personal and confidential use of the individual or entity to whom it is addressed. If the reader of this message is not the intended recipient or an agent responsible for delivering it to the intended recipient, you are hereby notified that you have received this communication in error and that any review, dissemination, copying, or unauthorized use of this information, or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this communication in error, please notify us immediately by e-mail, and delete the original message. Thank you
