Patent
1990-05-18
1993-03-09
Levy, Stuart S.
395425, 395700, G06F 1200, G06F 9445
Patent
active
051931613
ABSTRACT:
A computer system and method for operating a computer system capable of running in mutually incompatible real and protected addressing modes, in which programs written for one mode can be run in the other mode without modification. The BIOS assembles two different common data areas for the two modes, each inclusive of device block pointers, function transfer table pointers, data pointers, and function pointers. The common data area for the real mode is assembled first. To assembly the pointers for the protected mode common data area, the offset values from the real mode area ae copied directly, and then selector values are inserted whose physical addresses correspond to the segments of the corresponding pointers in the real mode area. The selector values are derived from a segment descriptor table.
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Bealkowski Richard
Dayan Richard A.
Doria David J.
Kinnear Scott G.
Krantz Jeffrey I.
Brown, Jr. Winfield J.
International Business Machines Corp.
Levy Stuart S.
Terrile Stephen A.
Whitfield Michael A.
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