T e c h n i c a l i n f o r m a t i o n
11/5
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)
Amount
Function
0000,0000 – 0003,FFFF
256 KB
Base system memory (fixed)
0004,0000 – 0007,FFFF
256 KB
Base system memory (fixed)
0008,0000 – 0009,FFFF
128 KB
Base system memory or ISA memory
enabled in Setup
000A,0000 – 000B,FFFF
128 KB
ISA video DRAM
000C,0000 – 000E,FFFF
192 KB
Off board video BIOS (can be
shadowed) AIC-7870 SCSI BIOS (can
be shadowed)
000F,0000 – 000F,FFFF
64 KB
ISA memory, system BIOS (fixed)
0010,0000 – 00EF,FFFF
14 MB
System memory or unused
00F0,0000 – 00FF,FFFF
1 MB
System memory or EISA/ISA memory
0100,0000 – 3FFF,FFFF
1008 MB
System memory or unused
4000,0000 – BFFF,FFFF
1024 MB
EISA memory or I/O slave memory
C000,0000 – C1FF,FFFF
32 MB
Memory mapped math coprocessor
C200,0000 – FEBF,FFFF
944 MB
EISA memory or I/O slave memory
FEC0,0000 – FEC0,0FFF
4 KB
I/O APIC #1
FEC0,1000 – FEC0,1FFF
4 KB
I/O APIC #2
FEC0,2000 – FEC0,2FFF
4 KB
I/O APIC #3
FEC0,3000 – FEC0,3FFF
4 KB
I/O APIC #4
FEC0,4000 – FFDF,4FFF
32752 KB
EISA memory or I/O slave memory
FFE0,0000 – FFFF,FFFF
32 KB
EISA (BIOS/ECU)
Summary of Contents for APRICOT FT4200
Page 1: ...FT4200 Owner s Handbook NATIONAL ACCREDITATION OFCERTIFICATION BODIES ...
Page 2: ...APRICOT FT4200 OWNER S HANDBOOK ...
Page 10: ...APRICOT FT4200 Section One Startup and operating Upgrading and expansion ...
Page 36: ...APRICOT FT4200 Section Two Detailed service Information for authorised engineers ...