Method and apparatus for controlling parallel port drivers in a data processing system
摘要
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.
申请公布号
US5553306(A)
申请公布日期
1996.09.03
申请号
US19940301512
申请日期
1994.09.07
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
CLAFFEY-COHEN, MARGARET;LE, PHAT T.;LOUIE, TIMOTHY J.;NEEL, II, ALAN F.;WARD, JAMES P.