110387 EPR Package: Electron Paramagnetic Resonance Data Acquistion and Data Reduction Package Version: February 1979 Author: Chales M. Grisham, University of Virginia Submitted by: Salley O'Connor, University of Virginia, Charlottesville, VA Operating System: RT-11 V2C Source Language: (Some MACRO-11), FORTRAN IV Memory Required: 20K Hardware Required: Data Translation DT 1761 interface board Keywords: Plotting, Scientific Applications Abstract: The EPR package consists of programs and subroutines that are used for data acquisition and data reduction of EPR spectra obtained using the Varian EPR spectrometer which is interfaced to a PDP-11/03 computer. The interface is based upon a Data Translation DT 1761 interface board. A more detailed description of the interface hardware is to be published and will be available through the authors. EPR package includes programs and subroutines for digitizing EPR spectra for signal averaging, for storing spectra on floppy disks, for viewing spectra on a scope, for plotting spectra on a recorder (several plotting programs are available). It also includes programs for data reduction such as smoothing, spectral integration, addition of constants or multiplication by constants, scaling of spectra for plotting, shifting of spectra, finding maxima and minima in spectra or specified regions of spectra, and listing of the data array on the teletype for possible transfer to a large computer. The EPR package was designed for use with the PDP-11/03 microcomputer. It offers to the experimentalist a method of setting up a computer interface system for the EPR spectrometer at a very low cost. Most of the programs have been in operation for a year and a half and have been tested to be trouble-free. The EPR package may be useful to other experimentalists for use with a PDP-11/03 computer interface, after some modifications of the programs. The data acquisition routine is documented in sufficient detail for easy modification by the user or for modification for use with lab instruments other than the Varian EPR spectrometer. Some of the programs supplied are: SCAN, TRACE, VIEW, PLOT, SLOPLT, STAKPT, COMBIN, BASLIN, INTEG, SMOOTH, CONST, EXAMIN, GLUE. Media (Service Charge Code): Write-Up and Listing (DB), One RX01 Diskette (KA) Format: RT-11, 600' Magnetic Tape (MA) Format: RT-11