Memory Map - NEC Versa LXi Series Service And Reference 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
0D0000-0DFFFFh
0E0000-0EFFFFh
0F0000h-0FFFFFh
100000h-1FFFFFF
2000000-5FFFFFF
System Memory Map
Size Function
768 bytes BIOS Interrupt Vector Table
256 bytes BIOS Stack Area
256 bytes BIOS Data Area
639 KB Applications Memory (used by the
OS, device drivers, TSRs, and all
DOS applications)
64 KB Video Buffer (EGA and VGA)
32 KB Video Buffer (monochrome, CGA
colour, VGA monochrome)
32 KB Video Buffer (CGA, EGA colour,
and VGA colour)
64 KB Video ROM (EGA and VGA)
64 KB Used by Adapter ROMs (i.e.,
network controllers, hard disk
controllers, SCSI host adapters)
64 KB Used by System ROM adapters
(i.e., network controllers with boot
capability)
64 KB System AMIBIOS (includes Setup
and hard disk drive utilities)
32 MB Built-In Extended Memory
up to 256 MB Extended Memory
Specifications 9