Computer with electrically isolated printer port using shunt tra

Details Computer with electrically isolated printer port using shunt tra Computer with electrically isolated printer port using shunt tra

1991-08-12

1995-06-06

Lee, Thomas C.

Boots, shoes, and leggings

364DIG2, 36492792, 36492795, G06F 314, G06F 300

Patent

active

054230047

ABSTRACT:
A parallel port adapter, which provides a special buffering circuit on the four control lines from the system to the printer. This circuit provides a low-impedance bidirectional path for communication between the CPU and the printer, whenever any of the control lines is active. The circuit uses blocking diodes on all four lines, and uses pass transistors in parallel with the blocking diodes, and uses power-robbing to turn on the pass transistors whenever the port is in use.

REFERENCES:
patent: 4291266 (1981-09-01), Portmann
patent: 4603320 (1986-07-01), Farago
patent: 4607379 (1986-08-01), Marshall, Jr. et al.
patent: 4631698 (1986-12-01), Walsh et al.
patent: 5210846 (1993-05-01), Lee

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