| 摘要 |
A drive system for a magnetic core memory is disclosed using a pulsed current source to charge a selected group of lines common at one (sink) end and simultaneously raising the bias on the other open (drive) end. When the group has been charged sufficiently to forward bias a diode connected to a supply voltage VS, a termination resistor having a resistance approximately equal to the characteristic impedance of all lines common at the sink end, suppresses reflections and ringing. The output of the sink current source is connected to an isolating diode at the drive end of each line by a resistor, whereby the bias across the diode remains substantially constant as the lines are charged. A drive current source is selectively connected to one line of the selected (sink) group. A coupling diode in series with a resistor connected to a source of bias potential terminates the drive end of the selected line during the drive current rise time. When the sink current source is turned off after a memory cycle, a shunt switch is turned on to allow the selected group of lines to discharge to a level of approximately zero volts with respect to circuit ground. Two corresponding, but complementary sets of components are provided for read and write cycles with one shunt switch on during any given cycle to reduce voltage stresses on selection elements.
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