Boots – shoes – and leggings
Patent
1989-12-22
1992-01-14
Shaw, Dale M.
Boots, shoes, and leggings
364242, G06F 900, G06F 1300
Patent
active
050815776
ABSTRACT:
An improved device driver for a real time computer system operated by a nonmultitasking operation system and controlling the operation of polled peripheral devices which do not have an interrupt generation capability. The improved device driver of the present invention operates on the general principle of releasing control back to the operating system before completion of a task when a peripheral device is not in a state of readiness to perform its task. The technical approach is a single entry software routine utilizing a state variable to keep track of the internal state of execution of the device driver, which relinquishes control back to the operating system while waiting for the device to become ready to respond, thus allowing the CPU to execute other tasks. Before releasing control to the operating system, the state controlled device driver sets up a system timer interrupt, or sets a system request bit, with a locally optimized time interval which will bring control back to the device driver to assure subsequent continuation and completion of the task.
REFERENCES:
patent: 3749897 (1973-07-01), Hirvela
patent: 4257095 (1981-03-01), Nadir
patent: 4502038 (1985-02-01), Lowenthal et al.
patent: 4649479 (1987-03-01), Advani et al.
patent: 4701848 (1987-10-01), Clyde
Bodendorf Andrew
Harris Corporation
Shaw Dale M.
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