A fast event processor for counting loss-corrected gamma-spectrometry

The design of a fast microprogrammed direct memory access processor for a PDP-11/34 is described. The controller is able to address a storage area of 128K-16 bit words, enabling us to record several conventional spectra and loss-corrected spectra of 4096 channels in three byte precision simultaneously and in short temporal succession. Beyond it, the interface contains: a) system timing controller for multisource multiscaling; b) two d/A-converters for general purposes; c) display generator with gray scale control for an external oscilloscope; d) two 16-bit parallel input/output ports, which provide interfacing beetween peripheral devices and the minicumputer.