Method and apparatus for using device drivers of a first operati

Details Method and apparatus for using device drivers of a first operati Method and apparatus for using device drivers of a first operati

1995-08-16

1999-06-01

Lee, Thomas C.

395680, G06F 1516

Patent

active

059095768

ABSTRACT:
A method of and apparatus for using a device driver, or similarly system dependent software, of an operating system, which is single-tasking, in an operating system environment, which is multi-tasking. Each operating system operates according to known predefined driver models. The invention converts the calls from the multi-tasking system into calls of the single-tasking system by mapping the device driver command codes and entry points in accordance with the driver models of each operating system. The converted calls are provided to state logic, which also receives responses from the device driver. The state logic ensures that calls to the device driver are sequentialized, thus avoiding contention issues that may occur as a consequence of the multi-tasking environment and which the device driver may not have the appropriate functionality to handle. In this fashion, investments in system software, such as device drivers and TSRs, may be extended along the life of a subsequent operating system.

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