On Mon, 20 Oct 2008 15:00:48 -0500, Paul Gilmartin <[EMAIL PROTECTED]> wrote:
>I thought 31-bit was for compatibility with existing exploitation >of the sign bit; but there was no legacy convention of using >the sign bit of shorter addresses stored in a doubleword to >preserve compatibility with. > Nope, it was the use of a X'80' in the high-order byte of a fullword to terminate a variable-length parameter list (of fullwords). And, FWIW, the S360/67 did implement (as an option) 32-bit addressing... Really caused problems when some customers had to get off of TSS and try to stuff things in 31-bit. W. Kevin Kelley IBM POK Lab -- z/OS Core Technical Development ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
