Computer system having mode independent addressing
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United States of America Patent
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-
Mar 9, 1993
Issued Date -
N/A
app pub date -
May 18, 1990
filing date -
Mar 27, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
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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