Accession Number:

AD0705745

Title:

A MEMORY UNIT WITH NONDESTRUCTIVE READOUT,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1970-03-17

Pagination or Media Count:

13.0

Abstract:

A nondestructive-read storage device was developed which has a capacity of 16 20-digit words and is designed with 0.9 VT toroidal cores. The information is readout by field pulses whose strength is lower than the threshold field of the cores. Hence, only reversible polarity changes take place. Such storage requires highly stable sensing current pulses and is not critical to the number of readouts. The current amplitude is only about 30 percent of that conventionally used in storages with elastic read. The storage element is designed with two cores which improves the 1-signal to O-signal ratio and stabilizes the load of current shapers. Output 1 and 0 signals are of different polarities. The amplifier input is disabled for 3 mu sec during the write cycle, in order to preclude saturation of the transistor by discharge surge. Pulse-controlled diode decoders are used in the first and second stages of address decoding. An experimental hookup developed along the above lines had these characteristics write frequency, 300 kHz read frequency, 2 MHz minimal output, 5 mv time of operation, 30-50 percent that of conventional ferrite storage. Author

Subject Categories:

  • Computer Hardware

Distribution Statement:

APPROVED FOR PUBLIC RELEASE