Hello, August 16, 2007
We have a Varian (Finnigan) MAT 250 isotope ratio mass spectrometer from circa 1980. It is run by a Hewlett Packard 9815A calculator/computer of late '70's vintage that utilizes programs from DC100A tape cartridges. Unfortunately, after two years in storage, our HP 9815A computer is misbehaving. For example, its printer prints out, "memory overflow" on almost every key stroke. Only 136 steps of its original 2008 steps of memory are accessible. It uses RPN logic.
The HP 9815A service manual tells us that these calculators/computers originally came with a diagnostic "utility and test cartridge (09815-10004)", and a plug-in "test ROM assembly (98140-66501)". We appear to have neither of these diagnostic tools, so it is difficult for us to assess the problem(s).
Might anyone still have a spare HP9815A calculator/computer available, or the utility and test cartridge, or the test ROM assemby plug-in, that we could have, or borrow, or purchase, or copy, etc.? We also wouldn't mind finding a spare MAT 250, or 251, etc., either!!
To upgrade from the HP 9815A to a more modern computer looks to be a bit daunting, also.
Thank you, most very kindly.
Sincerely, Frank Simpson
School of Pharmacy
University of Wisconsin
777 Highland Ave
email: [log in to unmask]