Three typical hybrid computers in industry and educational institutions are presented. The hybrid computer designed and built at the University of Missouri at Rolla consists of an SCC-650 digital computer, a TR-48 analog computer, and a hybrid interface. The interface permits the digital computer to control the modes of operation on the analog computer. There are also 9 multiple-pole relays on the interface that can be controlled by the digital computer. A 320 hold removable patchboard is included in the interface. There are 40 trunks lines from the analog computer that are present on the patchboard. The 4 digital-to-analog channels and the 8 analog-to-digital channels are present on the patchboard. The relay contacts are available for patching on the patchboard. Also present on the patchboard are a 12-bit input status register, the 12 output bits of the accumulator, hybrid interface commands, and an assortment of patchable logic. The outputs of the flip-flops in the interface logic are displayed on a display panel. A set of switches for manual control of the analog computer modes is available on the interface. The patchboard allows a large amount of flexibility for solving problems on the hybrid computer --Abstract, page ii
