1996-07-22
1999-01-26
Lee, Thomas C.
395500, 395275, 395280, 395222, G06F 1300
Patent
active
058647104
ABSTRACT:
A computer system implements a standard modem without the use of a microcontroller. Instead, a digital signal processor is provided on an expansion card, but with direct links to the computer system itself. The code usually implemented in the microcontroller is instead implemented as a virtual modem controller to be called by the operating system of the computer itself. Further, this virtual modem controller includes a virtualized UART, that appears to the operating system software as a hardware UART, with entry points for calls to replace input/output instructions. In this way, standard device driver code written to execute input/output operations is easily converted to operate with the "virtualized" UART.
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Communications, Chapters 1, 2, & 3, Windows 95, Technical Reference Document, pp. i-xviii, and pp. 19-71.
AT&T Advance Data Sheet, WE.RTM. DSP16A-V32, v. 32 Data Pump Chip Set, Jun. 6, 1991.
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Brown Peter J.
Dykes Don A.
Eyres Kevin W.
Love Andrew L.
Sands G. Byron
Compaq Computer Corporation
Lee Thomas C.
Smith Michael G.
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