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Conventional memory

In DOS memory management, conventional memory, also called base memory, is the first 640 kilobytes of the memory on IBM PC or compatible systems. It is the read-write memory directly addressable by the processor for use by the operating system and application programs. As memory prices rapidly declined, this design decision became a limitation in the use…

Standards, 640 KB barrier & DOS driver software and TSRs

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Overview

640 KB barrier

DOS driver software and TSRs

DOS extenders

Advanced semantic analysis

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Map overview Semantic statistics

Conventional memory

Nodes97
Edges96
Triples77
Avg. degree1.98
Density0.020619
Components1

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Conventional memory

Top relations

related to 640 KB barrier · 20
Conventional memory → Avoiding, BIOS, CGA, Color Graphics Adapter, CPU, DOS, IBM PC, In, KB, Later, MB, PC, PCs, RAM, ROM BIOS, The, The Intel, This, UMA, UMBs
related to Additional memory · 19
Conventional memory → B000, B800, CGA, DR-DOS, EGA, Enhanced Graphics Adapter, IBM XT, KB, MDA, MDA/HGC, MEMMAX, Memory, Monochrome Display Adapter, One, Only CGA, QEMM, RAM, Sometimes, This
related to Driver and TSR optimization · 13
Conventional memory → An, DOS, For, Hardware, KB, KB UMB, Later, Loading, ROM, Some, This, TSR, TSRs
related to Upper memory blocks and loading high · 10
Conventional memory → As DOS, DR DOS, EMM386, Most, MS-DOS, QEMM, This, TSR, UMA, UMBs
related to DOS driver software and TSRs · 7
Conventional memory → DOS, Instead, KB, Most, Some, These, TSRs

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Important terminology

memory dos kb programs used conventional could 640 drivers tsrs mode use xms would barrier driver upper also ems address

Entity relationships Subject–Predicate–Object triples

SubjectPredicateObjectConfidenceSrc
used by DOSinstance ofIt is still present in IBM PC compatibles today if they are running in real mode0.80text
Lotus 1-2-3instance ofPrograms0.80text
which accessed video memory directlyinstance ofPrograms0.80text
needed to be patched to handle this memory layoutinstance ofPrograms0.80text
QEMMinstance ofand preserved application compatibility.This feature was first provided by third-party products0.80text
before being built into DR DOS 5.0 in 1990 then MS-DOS 5.0 in 1991instance ofand preserved application compatibility.This feature was first provided by third-party products0.80text
QEMM also proved popular.At startupinstance ofbut third-party products from companies0.80text
drivers could be loaded high using theinstance ofbut third-party products from companies0.80text
Conventional memoryrelated to 640 KB barrierThe0.60section
Conventional memoryrelated to 640 KB barrierKB0.60section
Conventional memoryrelated to 640 KB barrierIBM PC0.60section
Conventional memoryrelated to 640 KB barrierPCs0.60section

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