Wat (wie) is Upper Memory Block - definitie
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.
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
Wikipedia
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).
