Intermixing of different capacity memory array units in a comput

Details Intermixing of different capacity memory array units in a comput Intermixing of different capacity memory array units in a comput

1987-10-01

1988-07-26

Harkcom, Gary V.

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G06F 1300

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active

047605227

ABSTRACT:
A memory array unit (20) is used within a main memory (26) of a computer system (10). The memory (26) comprises a plurality of memory array units (20, 22, 24) and each of the memory array units (20, 22, 24) has an allocated address range of 0 to 16 megabytes. However, the memory array unit (20) has a capacity of only four megabytes. The usable address range is 0 to 2 megabytes and 8 to 10 megabytes. The remainder of the address range is a null. Upon development of an increased memory array unit (20) having a greater capacity, such as 16 megabytes, the new memory array unit (20) is directly substituted for the previous low capacity memory array unit. The new memory array unit (20) has a fully implemented address range from 0 to 16 megabytes. The low and high capacity memory array units can be intermixed or the low capacity units can be entirely replaced by the high capacity units without the need for modifying any of the computer system (10) or for modifying the system software.

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patent: 4234934 (1980-11-01), Thorsrud
patent: 4293910 (1981-10-01), Flusche et al.
patent: 4488256 (1984-12-01), Zolnowsky et al.

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