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Upper Memory Area (UMA)

The Upper Memory Area(UMA) the memory block from 640KB to 1024KB, is designated for hardware use, such as video RAM, BIOS.

First 128KB are called video RAM, it is reserved for video adapters, all bits used for graphics & images are stored in it.

Second 128KB is reserved for BIOS that resides in ROM chip of some adapter card.

Remaining is used by SCSI, ATA RAID, & SATA adapters with onboard BIOS chips, use a portion of this area to store their BIOS's.

The last 128KB of memory is reserved for motherboard BIOS.

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