Parallel port for connecting multiple devices and the method for

Electrical computers and digital data processing systems: input/ – Input/output data processing – Peripheral monitoring

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Details

710 7, 710 8, 710 20, G06F 1314

Patent

active

061417041

ABSTRACT:
A method of controlling a parallel port for connecting multiple devices is disclosed. The method controls the connection between a computer and one of the peripheral devices by way of using the different on-line codes corresponding to the peripheral devices respectively. Further, a common off-line code is set and shared by all peripheral devices. When the off-line code is sent out, all peripheral devices are disconnected from the computer, and the control status of the previous on-line device is backed up for the use of recovering the previous on-line state. Furthermore, a parallel port for connecting multiple devices is also proposed to incorporate with the controlling method such that the computer can switch the on-line state between an on-line peripheral device and the other peripheral standby devices.

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patent: 5758190 (1998-05-01), Johnson et al.
patent: 5894583 (1999-04-01), Johnson et al.
patent: 5901327 (1999-05-01), Ofek

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