Abstract: A rectangular housing has an electronics mounting frame shock mounted in it. The frame includes a plate and two angle members extending parallelly on opposite ends of the plate. A tray holding a controller electronics circuit board is suspended from the angles with knurled screws that can be hand fastened. A processor tray holds a processor circuit board. Spring-loaded plungers on one end of the processor tray attach the tray to flanges on the end of the plate distal from the controller tray. Hand-operable fasteners attach the other end of the processor tray to the angles overlying the controller tray. With these fasteners unscrewed, the processor tray may be pivoted upward, and a rod attached to one angle raised to stably support it, thus permitting access to the controller circuit. The controller tray may also be stably supported on top of the angles to provide access to a modular power supply beneath it. A rectangular frame extends the housing by one RETMA unit.

Abstract: A power supply system is enclosed in a housing. A disk drive receptacle is arranged in the front of the housing, and a power supply and card cage for the microcomputer are laterally arranged at the rear of the housing. The front and rear of the housing are air permeable for cooling air. A power supply control circuit, for control of the power supply, controls a solid state relay in series with the power input to the power supply. The power supply control circuit also generates control signals, indicating pending power failure, for the microcomputer arranged in the card cage.

Abstract: A power supply control circuit, for control of the power supply, controls a solid state relay in series with the power input to the power supply. The power supply control circuit also generates control signals, indicating pending power failure, for the microcomputer arranged in a card cage.