At 16:07 -0400 on 04/11/2011, Tom Marchant wrote about Re: Best way
to multiply doublewords?:
>you'd need to look at the passed in save area to see if you were
supplied with one which has room for the upper half of the registers.
You can not tell by looking at the save area that was passed to you
to determine the size of the save area that was passed to you.
I though that there was a flag (a text FxSA string) in the first word
of the save area if it is not a standard 72-byte SA. That should be a
tip-off to you being passed an extended SA. That flag is required so
that the dump formatting software can correctly format your save area
chain.