Boots – shoes – and leggings
Patent
1985-10-09
1988-05-24
Heckler, Thomas M.
Boots, shoes, and leggings
G06F 938
Patent
active
047470402
ABSTRACT:
The UNIX.RTM. and MS-DOS.RTM. 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.
REFERENCES:
patent: 4347565 (1982-08-01), Kaneda et al.
patent: 4493034 (1985-01-01), Angelle et al.
patent: 4530052 (1985-07-01), King et al.
patent: 4591975 (1986-05-01), Wade et al.
patent: 4597044 (1986-06-01), Circello
Blanset David R.
Butterfield David A.
Keverian Kenneth M.
Kline Charles S.
Popek Gerald J.
American Telephone & Telegraph Company
AT&T Information Systems Inc.
Heckler Thomas M.
Locus Computing Corporation
Slusky Ronald D.
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