Abstract: A DC voltage power supply circuit for suppressing turn-on transients applied to a switching voltage regulator circuit includes a relatively high impedance current suppression element connected in series between a rectifier circuit and a capacitive load, means for sensing a voltage drop developed across the suppression element, a diode network for developing a reference potential, and a silicon-controlled rectifier having a gate electrode responsive to the voltage drop developed across the current suppression element and the reference potential developed across the diode, for energizing a relay having contacts for disabling the switching regulator from supplying the load during the initial turn-on phase, and for shunting the current suppression element and activating the switching regulator after the capacitive load is substantially charged.

Abstract: Refresh memory apparatus for use in a CRT raster display system utilizes half field storage memories for ping ponging between updating and readout. In one TV mode of operation the even and odd raster lines are stored in the respective memories and in another TV mode the top and bottom halves of the frame are stored therein. The most significant bit and least significant bit of the vertical address signals are multiplexed to control the ping pong reading and writing of the memories and are multiplexed with the remainder of the address signal to provide the read and write addresses for the memories. The multiplexers are controlled in accordance with the TV mode in which the system is operating.