Hello,                   November 2, 2009

     We have a Varian MAT 250 isotope ratio mass spectrometer (SN#
8223).  This instrument was manufactured in December 1979, a year or
more before MAT was purchased by Finnigan.  Unlike the subsequent 251
model, which used an Apple II computer, our MAT 250 uses a Hewlett
Packard 9815a calculator/computer to operate the mass spectrometer.
The hp 9815a calculator/MAT 250 system came with a set of programs on
DC 100 cassette tapes.  Some of these tapes were pre-programmed by hp,
and some were pre-programmed by the MAT factory at Bremen.

     Does anyone still have a Varian/Finnigan MAT 250, or a Hewlett
Packard 9815a calculator/computer, or any of the program tapes for
this instrument?

     Thank you, very much!


                     Sincerely, Frank Simpson


University of Wisconsin, USA
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1-608-849-3382