9-8
Specifications
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.
System 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
64 KB
Video ROM (EGA and VGA)
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
up to 256 MB
Extended Memory
Summary of Contents for VERSA SXI
Page 1: ...NEC VERSA SXI SERIES S E R V I C E A N D R E F E R E N C E M A N U A L...
Page 65: ...4 System Board Layout Connector Board Main Board...
Page 68: ...5 Illustrated Parts Breakdown Illustrated Parts Breakdown Parts List...
Page 69: ...5 2 Illustrated Parts Breakdown Illustrated Parts Breakdown...
Page 75: ...7 Troubleshooting Quick Troubleshooting Helpful Questions...
Page 83: ...9 Specifications System Components Connector Locations Memory Map Interrupt Controllers...