On Mon, 9 Feb 2009 12:19:53 -0800, Don Russell <[email protected]> wrote:
>BAL was pretty much obsolete when IPM came into existance. Unless of course >your code had to run on an old box. I have not come across an instance yet >when I needed BAL, and often use OPSYN to map BAL/R to BAS/R. >If I REALLY need BAL/R, I'll code a DC X'45' or DC X'05' and add a comment >saying I really, really need BAL/R here... > I have a very vague memory of one subroutine which was written to be sensitive to whether it was invoked via a BAL or a BALR instruction. It looked at the ILC in the "link register" and set a flag depending on whether the ILC was 1 (BALR) or 2 (BAL). Of course, it only worked in AMODE(24), so it not really very useful anymore. -- John ---------------------------------------------------------------------- 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
