Ncr Corporation

Wesley D Dickover

Barry M Mergenthaler

Gene L Amacher

A circuit for use with logic circuitry preventing any transients due to the power down and power up conditions of a power supply from causing any false or random operations of the logic. The turn off transients are suppressed by a reset signal to the logic circuitry generated by a timing module which is triggered when it detects an absence of AC signal over a specified period of time and is then held in a reset mode until the power supply voltage completely decays. The turn on transients are suppressed by a reset signal to the logic circuitry generated by the timing module, which is held in a reset mode until the power supply voltage has stabilized.

Time dependent master reset

A computer to computer data communication system for minimizing software protocol is disclosed wherein transmitted errors in data transmitted from one computer to another are detected when they occur by means of a bit-by-bit data echo transmission technique. True and inverted or complementary data are transmitted simultaneously serially over twisted pair lines for comparison, bit-by-bit by comparing each transmitted bit to the corresponding inverted bit to derive an error signal indicative of the condition of like polarity of the compared bits. If the compared bits are of like polarity, an error signal is generated to enable correction of the transmission error on a word by word basis, while inhibiting processing of the uncorrected data. Concurrently, received data is returned to the transmitting processor over a return data line for a like comparison. When an error condition exists, the returned data is inverted, forcing an error condition and inhibiting further transmission for the remainder of the transfer cycle. Thus, bit-by-bit detection, word-by-word correction and a variable block length capability in a double data transfer environment are accomplished, with both data processing and transmission inhibited until data errors are corrected.

Growing community of inventors

Cambridge, OH, United States of America

Wesley D Dickover