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4-18 System Board
Memory Map
The system memory map is shown in the following table.
System Memory Map
Memory Space
Size
Function
100000-18000000
383 MB
Extended memory
FC000-FFFFF
16 KB
Boot block
FA000-FBFFF
8 KB
ESCD (Plug and Play Configuration and DMI)
F9000-F9FFF
4 KB
Reserved for BIOS
F8000-F8FFF
4 KB
OEM logo or Scan User Flash
E8000-E7FFF
64 KB
POST BIOS
E0000-E7FFF
32 KB
POST BIOS (currently available as UMB)
C8000-D7FFF
96 KB
Available HI DOS memory (open to ISA and PCI bus)
A0000-C7FFF
160 KB
Video memory and BIOS
9FC00-9FFFF
1 KB
Extended BIOS data (movable by memory manager software)
80000-9FBFF
127 KB
Extended conventional memory
00000-7FFFF
512 KB
Conventional memory
I/O Addresses
The processor communicates with I/O devices by I/O mapping. The
hexadecimal (hex) addresses of I/O devices are listed in the following table.
Note
:
In Plug and Play systems, these addresses are
typical but may vary by configuration.
I/O Address Map
Address (Hex)
I/O Device Name
0000-000F
PIIX4 - DMA controller 1 (channel 0-3)
0020-0021
PIIX4 - interrupt controller 1
002E-002F
Super I/O controller configuration registers
0040-0043
PIIX4 - counter/timer 1
0048-004B
PIIX4 - counter/timer 2
0060
Keyboard controller byte - reset IRQ
0061
PIIX4 - NMI, speaker control
0064
Keyboard controller, command/status byte
Summary of Contents for PowerMate VT 300i Series
Page 14: ...1 System Overview Configurations Features Components ...
Page 27: ...2 System Configuration Interrupt Requests Jumper Settings BIOS Setup Video Modes Utilities ...
Page 82: ...4 System Board Connectors Jumpers and Sockets Components Resources ...
Page 108: ...6 Preventive Maintenance System Cleaning Keyboard Cleaning Mouse Cleaning ...
Page 111: ...7 Troubleshooting Checklist Diagnostics ...
Page 155: ...NEC PowerMate VT 300i Series Release Notes A 11 ...
Page 184: ...Regulatory Statements FCC Statement Note for Canada Battery Replacement Battery Disposal ...