Method for expanding addressable memory range in real-mode proce

Details Method for expanding addressable memory range in real-mode proce Method for expanding addressable memory range in real-mode proce

1994-09-21

1997-06-24

Lane, Jack A.

395570, G06F 1206

Patent

active

056424914

ABSTRACT:
Disclosed is a technique for overcoming the 1-Mbyte mode memory limitation associated with "real-mode" operation of certain Intel Corp. microprocessor architectures. This limitation can be overcome by altering the contents of a register portion that is computationally meaningful only in "protected mode," but which persists and exerts effects in real mode. By indirectly manipulating the contents of this register portion in protected mode in a manner that avoids disruption to the register during the switch back to real mode, access can be obtained, in real mode, to up to 4 Gbytes of volatile memory.

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Chappell, Geoff. DOS Internals, chapter 8, "Extended Memory Access From Real Mode". pp. 355-385. Jan. 1994.

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