Patent
1996-03-27
1998-06-09
Meky, Moustafa M.
G06F 1540
Patent
active
057650217
ABSTRACT:
Connecting a null modem cable between first and second communications ports of a host computer and executing a background routing program which transfers information between the second communications ports and a host signal processor (HSP) modem enables a DOS application which is configured to directly access a hardware UART of the first communication port to communicate with the HSP modem even if the HSP lacks a hardware UART. In one embodiment, the DOS application runs in a DOS virtual machine in a Windows.TM. operating system, and the routing application runs in a system virtual machine. The HSP modem includes a software portion inside a port driver in the operating system kernel. The routing program is started before the DOS application, executed in the background of the DOS application, and removed after completion of the DOS application.
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Hsu Tseng Jan
Hsu Wen-Liang
MacPherson Alan H.
Meky Moustafa M.
Millers David T.
PC-Tel, Inc.
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