Computer system having second program for transferring data between second port connected to a first port and the software portion of a modem
US5765021A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 27, 1996 |
| Grant date | Jun 9, 1998 |
| Priority date | — |
| Expiry date | Mar 27, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M11/06
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.