Keywords

#upper_memory_area

Upper memory area

Physical memory region on IBM PC compatibles

In DOS memory management, the upper memory area (UMA) is the memory between the addresses of 640 KB and 1024 KB (0xA0000–0xFFFFF) in an IBM PC or compatible. IBM reserved the uppermost 384 KB of the 8088 CPU's 1024 KB address space for BIOS ROM, Video BIOS, Option ROMs, video RAM, RAM on peripherals, memory-mapped I/O, and obsoleted ROM BASIC.

Thu 4th

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Upper memory area Extended memory Expanded memory Conventional memory DOS memory management High memory area Memory-mapped I/O and port-mapped I/O SmartDrive LOADHIGH List of DOS commands
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