Method and apparatus for redirecting input/output device data in

Details Method and apparatus for redirecting input/output device data in Method and apparatus for redirecting input/output device data in

1997-01-31

2000-08-29

Lee, Thomas O.

Electrical computers and digital data processing systems: input/

Input/output data processing

Transfer direction selection

710 5, 710 33, 710 64, 710260, 375220, 375222, 379 9308, G06F 702, G06F 1314

Patent

active

061122602

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, and the operating system driver software need not even have its input and output instructions replaced. Instead, debug registers are provided as breakpoints whenever an input/output instruction is executed to the I/O port range at which the UART would normally appear.

REFERENCES:
patent: 5193174 (1993-03-01), Bealkowski et al.
patent: 5408614 (1995-04-01), Thornton et al.
patent: 5479652 (1995-12-01), Dreyer et al.
patent: 5533198 (1996-07-01), Thorson
patent: 5628030 (1997-05-01), Tuckner
patent: 5644593 (1997-07-01), Bailey et al.
patent: 5745770 (1998-04-01), Thangadurai et al

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