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Qu'est-ce (qui) est upper memory block - définition

THE 384KIB AREA OF PHYSICAL MEMORY BETWEEN 640KIB AND 1024KIB ON IBM PC COMPATIBLES

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upper memory block

<storage> (UMB) Up to 64 kilobytes of the {expanded memory page frame} above the first 64 kilobytes. The UMB can be used to store TSR programs or device drivers thereby freeing parts of the precious conventional memory. The UMB is provided by special memory manager programs; many EMMs can provide UMB as well. (1996-01-10)

Upper memory area

In DOS memory management, the upper memory area (UMA) refers to 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.

https://en.wikipedia.org/wiki/Upper_memory_area

Replay Protected Memory Block

Draft:Replay Protected Memory Block

A Replay Protected Memory Block (RPMB) is provided as a means for a system to store data to the specific memory area in an authenticated and replay protected manner, and can only be read and written via successfully

https://en.wikipedia.org/wiki/Replay_Protected_Memory_Block

Wikipédia

Upper memory area

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.

However, even with video RAM, the ROM BIOS, the Video BIOS, the Option ROMs, and I/O ports for peripherals, much of this 384 KB of address space was unused. As the 640 KB memory restriction became ever more of an obstacle, techniques were found to fill the empty areas with RAM. These areas were referred to as upper memory blocks (UMBs).

https://en.wikipedia.org/wiki/Upper memory area