Boots – shoes – and leggings
Patent
1989-04-25
1990-11-20
Fleming, Michael R.
Boots, shoes, and leggings
3642415, 3642808, G06F 946
Patent
active
049723120
ABSTRACT:
A multiprocess computer executes operating system routines and user processes. One specific peripheral apparatus has a preferential status in that it may emit attention interrupts and/or completion interrupts that relate to an I/O-operation. Only those interrupts find preferential treatment in that the associated interrupt has a higher priority level than the one(s) corresponding to the majority of the operating system routines. In contradistinction to all other user process interrupts the above attention and completion interrupts are executed in their own hardware and software context, to which effect the latter context is temporarily activated, and after execution of the interrupt procedure restored to its previous status. In this way dialog with the peripheral may be executed real-time, while the "own" context greatly facilitates programming. An upgraded driver program is also presented.
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Writing a Device Driver for VAX/VMS, Chapter 11, Digital Equipment Corporation, Apr. 1986.
Chun Debra A.
Fleming Michael R.
U.S. Philips Corporation
Wieghaus Brian J.
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