Integrated modem which employs a host processor as its controller

  • US 5,170,470 A
  • Filed: 05/02/1988
  • Issued: 12/08/1992
  • Est. Priority Date: 05/02/1988
  • Status: Expired due to Term
First Claim
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1. In a computer having a host processor that is responsive to a communications program in a program memory to generate and receive control and data characters on an internal bus for use in communicating with other computers, a communications system which employs said host processor as a virtual controller, comprising:

  • a modem including means for receiving data characters from said internal bus and transmitting them onto a telephone line and for receiving data characters from said telephone line and placing them on said internal bus;

    interface means, including at least one register for receiving control and data characters generated by said host processor in response to said communications program, for generating a predetermined interrupt request indicative of receipt of said control and data characters;

    a modem driver program stored in said program memory and containing instructions for configuring said modem to carry out operations commanded by said communications program and controlling the operation of said modem to transfer data between the telephone line and said interface means; and

    control means responsive to the generation of said predetermined interrupt request by said interface means for causing said host processor to access said modem driver program stored in said program memory and to control said modem in accordance with the instructions contained in said modem driver program.

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