FPE questions: this is a hard one!

[gudat@avalon.physik.unizh.ch (gudat henrik)]

HELP!
I'm still having problems with the FPE card..anybody out there who
knows how THIS works?
 
THE PROBLEM: when evaluating a formula, the FPE routines - a bunch of
macros (provided by the manufacturer) - work fine FOR SOME TIME.
Suddenly, let's say after 500 calls (sometimes immediately, sometimes
not at all...funny, eh?) the FPE gives up and returns always the same
number (a random number..sigh!).
 
NOW: the program is not responsible for this problem: when the FPE code
is turned off and SANE is called, everything works fine again.
 
I suspect that the FPE is a bit confused from time to time. I noticed
that resetting the card _helps_, but the manual does not say how a
program can detect such a situation. It only says: "..if the FPE
returns $0D1D in the response register, then the attempted operation
was invalid." HOW IS THIS POSSIBLE? The manual clearly states in
another paragraph that you should never test for anything other than
$8900.. ("WARNING: don't...")
 
PLEEEASE could someone enlighten me?
 
Merci beaucoup,
 
henrik

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