Technical Reference
43
2.1.2
Memory Map
Table 13 lists the system memory map.
Table 13. System Memory Map
Address Range
(decimal)
Address Range
(hex)
Size
Description
1024 K - 33550336 K
100000 – 7FFC00000
32764 MB
Extended memory
960 K - 1024 K
F0000 - FFFFF
64 KB
Runtime BIOS
896 K - 960 K
E0000 - EFFFF
64 KB
Reserved
800 K - 896 K
C8000 - DFFFF
96 KB
Potential available high DOS
memory (open to the PCI
Conventional bus). Dependent on
video adapter used.
640 K - 800 K
A0000 - C7FFF
160 KB
Video memory and BIOS
639 K - 640 K
9FC00 - 9FFFF
1 KB
Extended BIOS data (movable by
memory manager software)
512 K - 639 K
80000 - 9FBFF
127 KB
Extended conventional memory
0 K - 512 K
00000 - 7FFFF
512 KB
Conventional memory
2.2
Connectors and Headers
CAUTION
Only the following connectors and headers have overcurrent protection: back panel
and front panel USB, and serial.
The other internal connectors and headers are not overcurrent protected and should
connect only to devices inside the computer’s chassis, such as fans and internal
peripherals. Do not use these connectors or headers to power devices external to the
computer’s chassis. A fault in the load presented by the external devices could cause
damage to the computer, the power cable, and the external devices themselves.
Furthermore, improper connection of USB header single wire connectors may
eventually overload the overcurrent protection and cause damage to the board.
This section describes the board’s connectors. The connectors can be divided into
these groups:
•
Back panel I/O connectors
•
Component-side connectors and headers (see page 45)
