Method and apparatus for selectively reclaiming a portion of RAM

Details Method and apparatus for selectively reclaiming a portion of RAM Method and apparatus for selectively reclaiming a portion of RAM

1990-05-09

1993-02-16

Fleming, Michael R.

Boots, shoes, and leggings

395700, 3642431, 36424531, 3642457, 3649642, G06F 946

Patent

active

051877929

ABSTRACT:
An apparatus and method for reclaiming a portion of random access memory in a personal computer system. The personal computer system comprises a system processor, a memory controller, a random access main memory, a read only memory, and at least one direct access storage device. The read only memory includes operating system microcode. The memory controller regulates communications between main memory and the system processor. In response to signals from the system processor, the memory controller can either execute the microcode out of the read only memory and recover main memory previously used to store the microcode, or disable read only memory, copy the microcode to main memory and execute the microcode out of main memory.

REFERENCES:
patent: 4787032 (1988-11-01), Culley
patent: 4849875 (1989-07-01), Fairman
patent: 4985871 (1991-01-01), Catlin
patent: 5021983 (1991-06-01), Nguyen et al.
IBM Technical Disclosure Bulletin, vol. 25, No. 7B, Dec. 1982, "Program-Controlled Paging Scheme for Memory Expansion", Skelton.

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