Method and apparatus for controlling parallel port drivers in a data processing system

Method and apparatus for controlling parallel port drivers in a data processing system

A parallel port interface for utilization between a first device and a second device designated by a user for transmitting a digital signal from the device to the second device. The parallel port interface includes a switchable driver circuit for transmitting the digital signal, which includes a fir...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: WARD, JAMES P, LOUIE, TIMOTHY J, LE, PHAT T, NEEL, II, ALAN F, CLAFFEY-COHEN, MARGARET
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Beschreibung
Zusammenfassung:A parallel port interface for utilization between a first device and a second device designated by a user for transmitting a digital signal from the device to the second device. The parallel port interface includes a switchable driver circuit for transmitting the digital signal, which includes a first circuit for emulating an open collector circuit and a second circuit for emulating a totem pole circuit. The switchable driver circuit is controlled by a logic control circuit that automatically selects either the first circuit or the second circuit for transmitting the digital signal in response to the digital signal and a designation of the second device.