Computer system for sensing a cable-connected peripheral and for

Details Computer system for sensing a cable-connected peripheral and for Computer system for sensing a cable-connected peripheral and for

1994-07-05

1995-04-18

Harrell, Robert B.

Boots, shoes, and leggings

364DIG1, 364235, 3642357, 3642481, 364273, 3642732, 3642735, G06F 710

Patent

active

054086698

ABSTRACT:
A computer system including an input/output (I/O) connector for connecting to an external data peripheral, where the computer includes circuitry for detecting the presence or absence of a load on a first pin and for providing power to the external data peripheral through a second pin of the I/O connector. In this manner, the external data peripheral need not include a separate power supply, but instead is sensed and powered by the computer itself through the I/O connector. In the preferred embodiment, the I/O connector is coupled to parallel port circuitry for interfacing to an external printer, and also to a floppy controller for interfacing with an external floppy drive, where the computer system further includes circuitry to switch from the printer controller to the floppy controller when an external floppy drive is connected to the I/O connector. In this manner, the same I/O port automatically serves either an external printer or an external floppy drive.

REFERENCES:
patent: 5038299 (1991-08-01), Maeda
patent: 5151992 (1992-09-01), Nagae
patent: 5179710 (1993-01-01), Coschieri
patent: 5300874 (1994-04-01), Shimamoto et al.
patent: 5335338 (1994-08-01), Proesel
TEAC, Inc., TEAC 3.5-Inch Floppy Disk Drive, FD-05 Series, 1991.
TEAC, Inc., TEAC FD-05HF-030 Micro Floppy Disk Drive Specification, Rev. B, 1991, pp. i-ii, 1-32.

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