Computer system for avoiding coincidence of port address on a bu

Details Computer system for avoiding coincidence of port address on a bu Computer system for avoiding coincidence of port address on a bu

1995-03-21

1997-10-21

Hafiz, Tariq R.

395427, 395827, 39520001, G06F 100, G06F 118

Patent

active

056806256

ABSTRACT:
In a computer system, when an expansion unit is connected to a computer main body by an interface card, power supply control and I/O port selection are performed at the start of the computer system. In the power supply control, when an expansion power supply of the expansion unit is turned on, a first voltage is supplied to a main power supply of the computer main body. When the main power supply is turned on, main voltages are supplied to computer main body elements from the main power supply in response to the main voltage, and a second voltage is supplied to the expansion power supply through the interface. In response to the second voltage, expansion voltages is supplied to expansion unit elements, and an interface voltage is supplied to the interface. After the power supply control is completed, the I/O port selection is performed. The port addresses of the I/O ports in the computer main body are compared with the port addresses of the I/O ports in the expansion unit. If both port addresses coincide with each other, the I/O ports in the computer main body are disabled, and the I/O ports in the expansion unit are enabled.

REFERENCES:
patent: 4485438 (1984-11-01), Myrmo et al.
patent: 4763247 (1988-08-01), Borovski et al.
patent: 4794520 (1988-12-01), Kobus, Jr. et al.
patent: 5428798 (1995-06-01), Sekine et al.
patent: 5452401 (1995-09-01), Lin

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