It was, indeed, a non-initialized numeric variable in working-storage of
the DYNAMIC program.
Many thanks for your help. I checked several hundred variables, and
found it in the end.

Regards

Dave H


-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On
Behalf Of Jeff Kell
Sent: 01 August 2006 22:52
To: [log in to unmask]
Subject: Re: [HP3000-L] Called program fails to fail when DISPLAY is
added


Steve Cooper wrote:
> This is actually quite common.  My guess is that there is an 
> uninitialized variable or perhaps a parameter which is thought to be 
> longer than it actually is.  When you do the display first, different 
> junk is left on the stack, thereby "initializing" your unitialized 
> variable to a value that does not crash the program.
Yes, and having a DISPLAY in the CM code versus not having it causes a
sizeable fixed buffer to be allocated for the DISPLAY.  This shuffles
the relative locations of your variables in the stack, not to mention
making it larger (I've seen DISPLAYs "fix" bounds violations on
occasion).

Jeff

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