NEC VERSA 6220 - SERVICE, User Manual

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Specifications B-7
MEMORY MAP
The system supports system and video shadowing, both controlled through
complementary metal oxide semiconductor (CMOS). The system supports
BIOS as a cacheable area with write protection. The following table shows
the system's memory map.
Memory Space Size Function
000000-0002FFh 768 bytes BIOS Interrupt Vector Table
000300-0003FFh 256 bytes BIOS Stack Area
000400-0004FFh 256 bytes BIOS Data Area
000500-09FFFFh 639 KB Applications Memory (used by the
OS, device drivers, TSRs, and all
DOS applications)
0A0000-0AFFFFh 64 KB Video Buffer (EGA and VGA)
0B0000-0B7FFFh 32 KB Video Buffer (monochrome, CGA
color, VGA monochrome)
0B8000-0BFFFFh 32 KB Video Buffer (CGA, EGA color,
and VGA color)
0C0000-0CBFFFh 48 KB Video ROM (EGA and VGA)
0CC000-0CFFFFh 16 KB Unused. (Reserved for Adapter
ROMs and other devices requiring
ROMs)
0D0000-0DFFFFh 64 KB Used by Adapter ROMs
(i.e., network controllers, hard disk
controllers, SCSI host adapters)
0E0000-0EFFFFh 64 KB Used by System ROM adapters
(i.e, network controllers with boot
capability)
0F0000h-0FFFFFh 64 KB System AMIBIOS (includes Setup
and hard disk drive utilities)
100000h-1FFFFFF 32 MB Built-in Extended Memory
2000000-5FFFFFF 64 MB Extended Memory