Memory Map - NEC Versa LX User Manual

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
000000-0002FFh
000300-0003FFh
000400-0004FFh
000500-09FFFFh
0A0000-0AFFFFh
0B0000-0B7FFFh
0B8000-0BFFFFh
0C0000-0CBFFFh
0CC000-0CFFFFh
0D0000-0DFFFFh
0E0000-0EFFFFh
0F0000h-0FFFFFh
100000h-1FFFFFF
2000000-5FFFFFF
8-12 Specifications
System Memory Map
Size
768 bytes
256 bytes
256 bytes
639 KB
64 KB
32 KB
32 KB
48 KB
16 KB
64 KB
64 KB
64 KB
32 MB
64 MB
Function
BIOS Interrupt Vector Table
BIOS Stack Area
BIOS Data Area
Applications Memory (used by the OS,
device drivers, TSRs, and all DOS
applications
Video Buffer (EGA and VGA)
Video Buffer (monochrome, CGA colour,
VGA monochrome)
Video Buffer (CGA, EGA colour, and VGA
colour)
Video ROM (EGA and VGA)
Unused. (Reserved for Adapter ROMs and
other devices requiring ROMs)
Used by Adapter ROMs (i.e., network
controllers, hard disk controllers, SCSI host
adapters)
Used by System ROM adapters (i.e.,
network controllers with boot capability)
System AMIBIOS (includes Setup and hard
disk drive utilities)
Built-In Extended Memory
Extended Memory