Programmable control of EMS page register addresses

Details Programmable control of EMS page register addresses Programmable control of EMS page register addresses

1991-04-22

1993-09-21

Dixon, Joseph L.

395425, G06F 1200, G06F 1202, G06F 1206, G06F 1210

Patent

active

052476316

ABSTRACT:
A hardware system provides a programmable method for addressing expanded memory specification (EMS) registers in a personal computing system functioning with an MS-Dos.RTM. operating system or the like. The system provides hardware flexibility for addressing EMS registers at different addresses than the standard LIM EMS specification calls for, to permit utilization of register addresses in otherwise unavailable locations. The address translations are effected through hardware; so that no additional delays in the circuit operation occur.

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"Expanded Memory: Writing Programs that Break the 640K Barrier", Hansen et al, Microsoft Systems Journal, vol. 2, No. 1, Mar. 1987, pp. 21-32.
"Understanding Expanding Memory Systems" in The Waite Group's MS--DOS Papers for MS-DOS Developers and Power Users, Howard W. Sams Company, 1988, pp. 532-562.

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