On 7 December 2012 08:22, McKown, John <[email protected]> wrote: > I'd lay good odds that most of the DCB oriented stuff will stay RMODE(24) > until the end of the age of mainframes. So much code is dependent on 3 byte > addresses that even if IBM wanted to update it, end users would revolt when > their applications which used 3 byte addresses from the 1980s abended. I > remember the nastiness when SWA went above the line and what was an address > became a token. Everybody had to either keep SWA below the line (an option), > or rewrite their code to use the SWAREQ(?) macro instead of "chain chasing".
Some even older of us will remember that in pre-MVS days those 3-byte values were TTRs in SYS1.SYSJOBQ, and it was a pleasant if short-lived and short-sighted thing to be able to just look at memory instead of scheduling I/O. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
