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The server supports both base (conventional) and extended memory. Base
memory is located at addresses 00000h to 9FFFFh (the first 640 Kbytes).
Extended memory begins at address 100000h (1 Mbyte) and extends to the
limit of addressable memory (2 Gbytes).
Some operating systems and application programs use base memory, e.g.
MS-DOS, OS/2, and UNIX. Other operating systems use both conventional
and extended memory, e.g. Windows and Windows NT. MS-DOS does not
use extended memory, however, some MS-DOS utility programs such as
RAM disks, disk caches, print spoolers etc., use extended memory for better
performance.
Memory Map
Address Range (hex)
0000,0000 – 0003,FFFF
0004,0000 – 0007,FFFF
0008,0000 – 0009,FFFF
000A,0000 – 000B,FFFF
000C,0000 – 000E,FFFF
000F,0000 – 000F,FFFF
0010,0000 – 00EF,FFFF
00F0,0000 – 00FF,FFFF
0100,0000 – 3FFF,FFFF
4000,0000 – BFFF,FFFF
C000,0000 – C1FF,FFFF
C200,0000 – FEBF,FFFF
FEC0,0000 – FEC0,0FFF
FEC0,1000 – FEC0,1FFF
FEC0,2000 – FEC0,2FFF
FEC0,3000 – FEC0,3FFF
FEC0,4000 – FFDF,4FFF
FFE0,0000 – FFFF,FFFF
T e c h n i c a l i n f o r m a t i o n
Amount
Function
256 KB
Base system memory (fixed)
256 KB
Base system memory (fixed)
128 KB
Base system memory or ISA memory
enabled in Setup
128 KB
ISA video DRAM
192 KB
Off board video BIOS (can be
shadowed) AIC-7870 SCSI BIOS (can
be shadowed)
64 KB
ISA memory, system BIOS (fixed)
14 MB
System memory or unused
1 MB
System memory or EISA/ISA memory
1008 MB
System memory or unused
1024 MB
EISA memory or I/O slave memory
32 MB
Memory mapped math coprocessor
944 MB
EISA memory or I/O slave memory
4 KB
I/O APIC #1
4 KB
I/O APIC #2
4 KB
I/O APIC #3
4 KB
I/O APIC #4
32752 KB
EISA memory or I/O slave memory
32 KB
EISA (BIOS/ECU)
11/5
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