Patrick O'Keefe wrote:
My experience with DOS preceeded DOS/VSE (and DOS/VS), but as I recall,
the linkage conventions for DOS and OS (including pre-MVS) were identical.
The difference was that the main routine was entered using a different
set (or maybe no set) of conventions - no R13 for save area and no R15
for the entry point. (R15 may have been iffy in subroutines, too, but
R13 ad R14 were savearea and return addresses.)
Yea, it has taken me years to replace:
NAME BALR,R12,R0
BCTR R12,R0
BCTR R12,R0
USING NAME,R12
NAME STM R14,R12,12(R13)
LR R12,R15
USING NAME,R12
etc....
It is amazing how just just eight or so years on DOS could do that to a
person.
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