Abstract
A data processing system of GS-MS having an excellent cost-performance was constructed by the introduction of the off-line system using an analog data recorder. HITACHI RMU-5B mass spectrometer was partially modified to process mass spectra, and the PDP-8/I digital computer with 8K core memory and the A/D converter was adopted. M/e values were calculated from the relations between mass number and time which is based on the He peak; then, there were no error to M/e300 during the operation of two monthes. Coefficient of variation of the pattern coefficient is about3to5%.
