METHOD AND APPARATUS FOR REVERSING THE RASTER SCAN OF A CRT

摘要

The apparatus of the invention enables a CRT to be readily adapted to display either one type of language from left to right or a different type of language from right to left. The apparatus includes a first relay (30) for connecting a power supply (25) to a CRT driver (32), and a second relay (42) connecting the CRT to the CRT driver (32), actuation of the second relay (42) serving to reverse the signals applied to first and second leads connected to horizontal deflection coil means of the CRT. Logic means (36) control the operation of the first and second relays (30, 42) whereby, in response to the generation of a control signal indicative of raster scan reversal, the first relay (30) is actuated to disconnect the power supply (25) from the CRT driver (32) prior to actuation of the second relay (42), after which the first relay (30) is reset so as to reconnect the power supply (25) to the CRT driver (32).