Apple Inc.

Rodger J Mohme

Steven J Young

R Steven Smith

Philippe A Le Bars

Robert E Cox

Eric Gradeler

Michael De La Cruz

Jerome M Okun

Barry Hochfield

Circuitry is described for providing a telephone line interface circuit of a MODEM for a computer with an AC impedance and DC voltage/current characteristics required by a given type telephone network such that the telephone line interface circuit can be matchingly connected with the given type telephone network. The given type telephone network provides an identification code representative of the required AC impedance and DC voltage/current characteristics. The circuitry comprises a plurality of impedance components that, when connected to the telephone line interface circuit, determine the AC impedance and DC voltage/current characteristics of the telephone line interface circuit. A plurality of terminals are coupled to receive a plurality of control signals associated with the identification code. A switching logic is coupled (1) between the plurality of impedance components and the telephone line interfacing circuit and (2) to the plurality of terminals for selectively connecting the plurality of impedance components to the telephone line interface circuit under the control of the plurality of control signals so as to cause the telephone line interface circuit to have the required AC impedance and DC voltage/current characteristics. An identifying circuit is coupled to the given type telephone network for identifying the required AC impedance and DC voltage/current characteristics by receiving the identification code and converting the identification code into the plurality of control signals.

Modem having an improved line interface circuit, in particular for a

A self-identifying scheme which permits a variety of integrated circuit semiconductor memory modules to inform a host processor as to each individual memory accessing speed or accessing time. Pre-encoded circuits within each memory module generate a coded signal when that module is selected by the host processor. The coded signal identifies the type of memory accessed, permitting the host processor to transfer information at a rate determined by the memory accessed.

Self identifying scheme for memory module including circuitry for

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Santa Cruz County, CA, United States of America

Rodger J Mohme