Boots – shoes – and leggings
Patent
1985-10-09
1988-05-10
Harkcom, Gary V.
Boots, shoes, and leggings
340798, 340799, 340721, G06F 314
Patent
active
047440481
ABSTRACT:
The UNIX.RTM. and $MS-DOS sup R $ operating systems are supported in a multi-tasking computer. At the heart of the computer is a microprocessor having protected and non-protected modes. The computer includes special-purpose hardware which prevents the MS-DOS system and its applications, which execute in the non-protected mode, from interfering with the UNIX system and its applications, which execute in the protected mode. In particular, this hardware monitors addresses generated by the computer and, by selectively inhibiting the associated control pulses, prevents the MS-DOS system from, for example, writing in UNIX-system-allocated memory, or accessing I/O devices that the UNIX system is currently using. In addition, a context switching feature is provided whereby the user can select, via a keyboard operation, to have displayed on the computer video monitor at any given time the image generated from the current UNIX system screen data or the image generated from the current MS-DOS system screen data.
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Blanset David R.
Butterfield David A.
Keverian Kenneth M.
Kline Charles S.
Popek Gerald J.
American Telephone and Telegraph Company
AT&T Information Systems Inc.
Harkcom Gary V.
Lacasse Randy W.
Locus Computing Corporation
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