Dynamically configurable personal computer card utilizing variab

Details Dynamically configurable personal computer card utilizing variab Dynamically configurable personal computer card utilizing variab

1996-08-20

1999-11-09

Dinh, Dung C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral monitoring

710 13, G06F 13110

Patent

active

059832886

ABSTRACT:
A system comprising a personal computer card and an interchangeable extension consists of a personal computer card a card information storage (CIS) system and a coaxial connection socket. First logic means are arranged to control an interrogation means comprising a digital-to-analog current converter, comparator and reference voltage source in order to supply a series of DC currents to the socket. The extension has a coaxial connection pin and grounded resistor having a value which identifies the type of extension so that when a DC current is applied to the pin by the socket, a characteristic voltage is generated across the resistor which is compared by the comparator with the reference voltage. The comparator indicates the value of resistor as a digital value to the CIS system which communicates the characteristics of the extension to a host PC. A second logic means disables power upon removal of a previous extension from the socket. Each extension may comprise a radio frequency antenna which may be external to the extension.

REFERENCES:
patent: 4575714 (1986-03-01), Rummel
patent: 5159683 (1992-10-01), Lvovsky et al.
patent: 5767500 (1998-06-01), Cordes et al.
Kenneth Short "Microprocessors and Programmed Logic", Prentice Hall, Inc, 1981, pp 430-440.

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