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Abstract
A number of computers and signal averagers suitable for EPR data acquisition and analysis are presently available, but all suffer from disadvantages of high cost and/or low flexibility. We have developed an alternative data system, which is based on the 16-bit LSI-11 microprocessor, and which provides a far superior alternative both in terms of economy and flexibility of application. This report describes the details of the interface between a DEC PDP 11VO3 microcomputer and a Varian Century Series EPR spectrometer. The basic computer system consists of the LSI-11 CPU, 16K or more of RAM memory, dual floppy disks, console, oscilloscope for video display, and a commercially available interface board. This interface board, which plugs directly into the LSI-11 bus, has 16 analog-to-digital channels with 12-bit resolution , as well as two 12-bit digital-to-analog converters. The subroutines which control the functions of this interface board are written in MACRO assembly language, while the main programs and other subroutines are written in FORTRAN. Programs have been written for signal averaging, spectral smoothing, baseline correction, scaled plotting, stacked plotting, spectral addition/subraction, spectral integration, peak search, spectral viewing on the scope and simulation of EPR spectra in solution. Several applications of this system are described.
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