Integrated modem which employs a host processor as its controlle

Details Integrated modem which employs a host processor as its controlle Integrated modem which employs a host processor as its controlle

1988-05-02

1992-12-08

Lee, Thomas C.

Boots, shoes, and leggings

395325, 364DIG1, 364DIG2, 364260, 3642408, 379 13, 375 8, G06F 300

Patent

active

051704706

ABSTRACT:
An embedded modem that does not require a dedicated controller and operates with existing computer to interpret new and redefined communications interrupt requests. In response to an interrupt request, the control of the processor is transferred from the communications software to a driver program stored in the main memory for the processor. Under the operation of the driver program, the processor interprets control characters and causes the appropriate commands to be carried out in the modem. Once these commands have been processed, the control of the processor reverts back to the communications program. The processor thereby functions as a virtual controller that is interpreted to be an external controller by the communications program.

REFERENCES:
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patent: 4012725 (1977-03-01), Spangler et al.
patent: 4291198 (1981-09-01), Anderson et al.
patent: 4620294 (1986-10-01), Leung et al.
patent: 4649479 (1987-03-01), Advani et al.
patent: 4742482 (1988-05-01), Inskeep et al.
patent: 4809269 (1989-02-01), Gulick
patent: 4825358 (1989-04-01), Letwin
patent: 4839916 (1989-06-01), Fields et al.
patent: 4922534 (1990-05-01), Gorniak et al.
Alan Clements, Microprocessor System Design PWS Publishers 1987 p. 389.

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