Nexcom PEAK 637 User manual

PEAK 637 User‘s Guide
Specification 1-1
PEAK 637
Single Board Computer
User′
′′′s Guide
@Copyright 2000
All Rights Reserved
Manual edition 1, May 2001
The information in this document is subject to change without prior notice
in order to improve reliability, design and function and does not represent commitment on
the part of the manufacturer.
In no event will the manufacturer be liable for direct, indirect, special, incidental, or
consequential damages arising out of the use or the possibility of such damages.
This document contains proprietary information protected by copyright. All rights are
reserved. No part of this manual may be reproduced by any mechanical, electronic, or other
means in any form without prior written permission of the manufacturer.
Trademarks
PEAK 637 is registered trademarks of NEXCOM Co., Ltd., IBM PC is a registered trademark of
International Business Machines Corporation. Intel and Pentium III are registered
trademarks of Intel Corporation. Award is a registered trademark of Award Software, Inc.
Other product names mentioned herein are used for identification purposes only and may be
trademarks and/or registered trademarks of their respective companies.

PEAK 637 User‘s Guide
Specification 1-2
Chapter 1: Specification
The PEAK 637 is a full size Single Board Computer. It applies single Socket 370 FC-PGA based
processor, supporting both 66 MHz (Celeron) and 100 MHz (Pentium III) FSB CPU up to 850 M+Hz and
future Intel 100MHZ FSB CPU to 1GHZ or 1.1GHZ. The memory it can accommodate is 512 MB
SDRAM up to 100 MHz.
PEAK 637 will be offered at extraordinary good pricing while also equip with powerful features.
System architecture
 Full size SBC with PCI/ISA Gold finger
 Intel Brand New Socket 370 Celeron/Pentium III with 66/100MHz FSB
 PCI V2.1 complied
 PICMG 1.0 (Rev.2.0) complied
CPU Support
 Intel Celeron/Pentium III (FC-PGA) CPU with 128/256 cache on die up 850MHz, and future Intel
100MHZ FSB CPU to 1GHZ or 1.1GHZ
 Supports streaming SIMD instruction
Main Memory
 Support SDRAM up to 512MB (Max.)
 168 pin DIMM socket ×2
BIOS
 Award System BIOS
Chip Set
 Intel 82440BX AGP set
 66/100MHz FSB support
 PCI V2.1 complied
On Board RTC
 High precision real time clock/calendar with battery back up
Watchdog Timer
 1, 2, 4 ….. 64 seconds time-out intervals

PEAK 637 User‘s Guide
Specification 1-3
On Board I/O
 Winbond 83977 Super I/O ON BOARD
 IDE Enhanced IDE mode 4, UltraDMA33, Two 40-pin connectors on the board.
 FDD Supports FDD, One 34-pin connector on the board.
 Serial Port Two serial ports
 COM1 9-pin D-sub connector at the I/O bracket
 COM2 10-pin flat-cable connector on the board
 Parallel Port Bi-directional SPP/EPP/ECP support, One 26-pin connector on board
 Keyboard One PS/2-type connector
 Mouse One PS/2-type connector
 USB Supports 2 USB channels (share one USB power fuse, 6pin header)
Dimensions
 338 mm (D) * 122 mm (W)
Power Requirements
 +5V：10A (Max.)
 +12V: 500mA (Max.)
 -12V: 50mA (Max.)
Environments
 Operating temperatures: -10°C to 60°C
 Storage temperatures: -40°C to 80°C
 Relative humidity: 5 ~ 95%RH (no-condensing))
Certification
 FCC Class A, CE marking
Operating System
 Supports DOS 6.X and above, Windows NT, Windows 95 and 98, WindowsMe, Windows2000,

PEAK 637 User‘s Guide
Jumper Setting and Pin Assignment 2-1
Chapter 2 Switches and Connectors
This chapter gives the definitions and shows where to locate the positions of switches and
connectors.
Connector Function
J1 CPU Fan Header
J2 SMBUS Connector
J3, J4 DIMM Socket
J8 Primary IDE Connector
J9 Secondary IDE Connector
J10 Reset Connector
J12 ATX Power Connector
J13 IDE Active LED
J15 Parallel Connector
J16 ATX Power Button
J17 FDD Connector
J18 Speaker Connector
J19 USB Connector
J20 External Keyboard Connector
J21 MOUSE Connector
J22 KEYBOARD Connector
J23 COM2
J24 COM1
J25 Wake On LAN Connector
JP3 Key Lock
JP5 IR Connector
 J16: ATX Power Button
PIN No. Description
1 +3.3V
2 PWRBT#
 RTC Clear
JP4
Enabled 1-2
*Disabled N/C

PEAK 637 User‘s Guide
Jumper Setting and Pin Assignment 2-2
 AT/ATX FUNCTION SELECT
*AT Function ATX Function
JP2 *1-2 2-3
J11 *1-2 2-3
 J10: Reset Connector
PIN No. Description
1 RESET
2 GND
 J12 ATX Power Connector
PIN No. Description
1 5VSB
2 GND
3 Power On#
 J13: IDE Active LED
PIN No. Description
1 +5V
2 ACTIVE#
 J1: CPU Fan Header Connector
PIN No. Description
1 GND
2 +12V
3 Sense
 J8 /J9: IDE Connector
PIN No. Description PIN No. Description
1 Reset# 2 Ground
3 Data 7 4 Data 8
5 Data 6 6 Data 9
7 Data 5 8 Data 10
9 Data 4 10 Data 11
11 Data 3 12 Data 12
13 Data 2 14 Data 13
15 Data 1 16 Data 14
17 Data 0 18 Data 15
19 Ground 20 N/C
21 DMA REQ 22 Ground
23 IOW# 24 Ground
25 IOR# 26 Ground
27 IOCHRDY 28 Ground
29 DMA ACK 30 Ground
31 Interrupt 32 NC
33 SA1 34 N/C
35 SA0 36 SA2
37 HDC CS1# 38 HDC CS3#
39 HDD Active# 40 Ground

PEAK 637 User‘s Guide
Jumper Setting and Pin Assignment 2-3
 J2: SMBUS Connector
PIN No. Description
1 SMBCLK
2 SMBDATA
 J15: Parallel Port Connector
PIN No. Description PIN No. Description
1 Strobe# 2 Data 0
3 Data 1 4 Data 2
5 Data 3 6 Data 4
7 Data 5 8 Data 6
9 Data 7 10 Acknowledge
11 Busy 12 Paper Empty
13 Printer Select 14 Auto Form Feed#
15 Error# 16 Initialize
17 Printer Select IN# 18 Ground
19 Ground 20 Ground
21 Ground 22 Ground
23 Ground 24 Ground
25 Ground 26 N/C
 J17: FDD Connector
PIN No. Description PIN No. Description
1 Ground 2 Density Select
3 Ground 4 N/C
5 N/C 6 Drate0
7 Ground 8 Index#
9 Ground 10 Motor Enable A#
11 Ground 12 Drive Select B#
13 Ground 14 Drive Select A#
15 Ground 16 Motor Enable B#
17 Ground 18 Direction#
19 Ground 20 Step#
21 Ground 22 Write Data#
23 Ground 24 Write Gate#
25 Ground 26 Track 0#
27 Ground 28 Write Protect#
29 N/C 30 Read Data#
31 Ground 32 Head Side Select#
33 Ground 34 Disk Change#
 J18: Speaker Connector
PIN No. Description
1 +5V
2 GND
3 GND
4 Speaker Signal

PEAK 636F User‘s Guide
Jumper Setting and Pin Assignment 2-4
 J19: USB Connector
PIN No. Description
1 +5V
2 USBD0-
3 USBD0+
4 USBD1-
5 USBD1+
6 GND
 J20: External Keyboard Connector
PIN No. Description
1 Keyboard Clock
2 Keyboard Data
3 N/C
4 GND
5 +5V
 J21: Mouse Connector
PIN No. Description
1 MOUSE DATA
2 N/C
3 GND
4 5V
5 MOUSE CLK
6 N/C
 J22: Keyboard Connector
PIN No. Description
1 KBDATA
2 N/C
3 GND
4 5V
5 KBCLK
6 N/C
 J23/J24: RS232 Connector
PIN No. Description
1 Data Carrier Detect (DCD)
2 Receive Data (RXD)
3 Transmit Data (TXD)
4 Data Terminal Ready (DTR)
5 Ground (GND)
6 Data Set Ready (DSR)
7 Request to Send (RTS)
8 Clear to Send (CTS)
9 Ring Indicator (RI)

PEAK 636F User‘s Guide
Jumper Setting and Pin Assignment 2-5
 J25: Wake On LAN Connector
PIN No. Description
1 5VSB
2 GND
3 PME#
 JP3: KEYLOCK Connector
PIN No. Description
1 VCC
2 N/C
3 GND
4 KEYLOCK
5 GND
 JP5: IR Connector
PIN No. Description
1 5V
2 IRRXH
3 IRRX
4 GND
5 IRTX

PEAK 636F User‘s Guide
Jumper Setting and Pin Assignment 2-6
Note: Watch Dog Timer
Watch Dog Timer Working Procedure
The Watch Dog Timer (WDT) is the special hardware device. The WDT function
is to monitor the computer system whether work normally, otherwise, it will
have some measures to fix up the system.
It contains a receivable SQW signal from RTC, and could set time and can clear
the counter function. When time is up, WDT can send Reset or NMI signal.
Operator has to write a value into WDT Configuration Register (Write the control
value to the Configuration Port), and clear WDT counter (read the Configuration
Port).
Watch Dog Timer character and function
WDT Configuration port F2 Default at F2
Watch Dog Timer Disabled 1. Default at disabled
Enabled 2. Enabled for user′s programming
WDT Time out active for Reset Default at Reset
NMI
WDT Active Time 1 sec
2 sec
4 sec
8 sec
16 sec
32 sec
64 sec
Default at 64 sec

PEAK 636F User‘s Guide
Jumper Setting and Pin Assignment 2-7
Watch Dog Timer Control Register
The Watch Dog Timer Control Register is to control the WDT working mode. You can
write the value to WDT Configuration Port.
The following is the Control Register bit definition.
7 6543210
XxX
111 : N/A
110 : Select 1 second
101 : Select 2 second
100 : Select 4 second
011 : Select 8 second
010 : Select 16 second
001 : Select 32 second
000 : Select 64 second
1 : Enable watch dog timer
0 : Disable watch dog timer
1 : Select NMI
0 : Select Reset
Don’t care
Watch Dog Timer Programming Procedure
•
••
•Power on or reset the system
The initial value of WDT Control Register (D4~D0) is zero, when power is on or reset
the system. The following means the initial value of WDT ( 00000000b ) :
Bit Value Mean
4 0 Select Reset
3 0 Disable watch dog timer
2, 1, 0 0 0 0 Select 64 second
•
••
•Initialize the SQW of RTC (set SQW output period=0.5 second)
To initialize the SQW of RTC processor is to set the SQW signal which is output
period=0.5 second. It offers the basic frequency of the WDT counter.
The following is an example of initializing the SQW signal program in Intel 8086
assembly language.

PEAK 636F User‘s Guide
Jumper Setting and Pin Assignment 2-8
; (Generate SQW = 0.5 Sec.)
Mov dx, 70h
Mov ax, 0Ah
Out dx, al ; Out port 70h = 0Ah
Mov dx, 71h
Mov ax, 2Fh
Out dx, al ; Out port 71h = 2Fh
; (enable the SQW output)
Mov dx, 70h
Mov ax, 0Bh
Out dx, al ; Out port 70h = 0Bh
Mov dx, 71h
Mov ax, 0Ah
Out dx, al ; Out port 71h = 0Ah
•
••
•Clear the WDT
Repeatedly read WDT Configuration Port and the interval cannot be longer than the
preset time, otherwise, the WDT will generate NMI or Reset signal for the system.
The following is an example of clear the WDT program in Intel 8086 assembly
language.
; ( Clear the WDT)
Mov dx, F2h ;Setting the WDT configuration port
In al, dx
Note: Before running WDT, you must clear the WDT. It means to make sure the initial
value is zero before enabling the WDT.
•
••
•WDT Control Register (Write to WDT configuration port)
You can set the WDT Control Register to control the WDT working mode.
The initial value of the WDT Control Register is as the following.
; (Setting the WDT Control Register as AL)
Mov al, 0h ; Setting initial value = 0 for the WDT Control Register
You must plan the option of following:
1. Select NMI or Reset: decide D4 value in F2.
i.e. Setting D4 = 0, then it select Reset
AND al, 11101111b ; Select Reset
i.e. Setting D4 = 1, then it select NMI
OR al, 00010000b ; Select NMI
2. Select the time-out intervals of WDT (decide the values of D2, D1, D0 in F2 )
Example: D2~D0 = 0, the time-out interval will be 64 sec.
AND al, 11111000b ; Setting the time-out interval as 64 sec.
3. Enable or Disable the WDT ( decide D3 value in F2)
i.e. D3=0, Disable the WDT
AND al, 11110111b ; Disable the WDT
i.e. D3=1, Enable the WDT
OR al, 00001000b ; Enable the WDT

PEAK 636F User‘s Guide
Jumper Setting and Pin Assignment 2-9
After finishing the above setting, you must be output for the Control Register’s value to
the WDT Configuration Port. Then WDT will start according to the above setting.
MOV dx, F2h ; Setting WDT Configuration Port
OUT dx, al ; Output the Control Register Value
•You should build in a mechanism in the program to continue to read the WDT
Configuration Port for clearing WDT before the time out.

PEAK 637 User‘s Guide
BIOS Setup 3-1
Chapter 3 AWARD BIOS Setup
Award's BIOS ROM has a built-in Setup program that allows users to modify the basic system configuration.
This type of information is stored in battery-backed RAM (CMOS RAM) so that it retains the Setup information
when the power is turned off.
Note: The picture in this document is subject to change without prior notice
Entering Setup
Power on the computer and press <Del> immediately will allow you to enter Setup. The other way to enter
Setup is to power on the computer, when the below message appears briefly at the bottom of the screen
during the POST (Power On Self Test), press <Del> key or simultaneously press <Ctrl>, <Alt>, and <Esc>
keys.
TO ENTER SETUP BEFORE BOOT PRESS <CTRL-ALT-ESC> OR <DEL> KEY
If the message disappears before you respond and you still wish to enter Setup, restart the system to try again
by turning it OFF then ON or pressing the "RESET" button on the system case. You may also restart by
simultaneously pressing <Ctrl>, <Alt>, and <Delete> keys. If you do not press the keys at the correct time and
the system does not boot, an error message will be displayed and you will again be asked to,
PRESS <F1> TO CONTINUE, <CTRL-ALT-ESC> OR <DEL> TO ENTER SETUP
Control Keys
Up arrow Move to previous item
Down arrow Move to next item
Left arrow Move to the item in the left hand
Right arrow Move to the item in the right hand
Esc key Main Menu -- Quit and not save changes into CMOS
Status Page Setup Menu and Option Page Setup Menu -- Exit current page and return to Main
Menu
PgUp / “+” key Increase the numeric value or make changes
PgDn / “−“ key Decrease the numeric value or make changes
F1 key General help, only for Status Page Setup Menu and Option Page Setup Menu
(Shift)F2 key Change color from total 16 colors. F2 to select color forward, (Shift) F2 to select color
backward
F3 key Reserved
F4 key Reserved
F5 key Restore the previous CMOS value from CMOS, only for Option Page Setup Menu
F6 key Load the default CMOS value from BIOS default table, only for Option Page Setup Menu
F7 key Load the Setup default , only for Option Page Setup Menu
F8 key Reserved
F9 key Reserved
F10 key Save all the CMOS changes, only for Main Menu

PEAK 637 User‘s Guide
BIOS Setup 3-2
Getting Help
Main Menu
The on-line description of the highlighted setup function is displayed at the bottom of the screen.
Status Page Setup Menu/Option Page Setup Menu
Press F1 to pop up a small help window that describes the appropriate keys to use and the possible selections
for the highlighted item. To exit the Help Window press <F1> or <Esc>.
The Main Menu
Once you enter Award BIOS CMOS Setup Utility, the Main Menu (Figure 1) will appear on the screen. The
Main Menu allows you to select from ten setup functions and two exit choices. Use arrow keys to select
among the items and press <Enter> to accept or enter the sub-menu.
Standard CMOS Setup
This setup page includes all the items in a standard compatible BIOS.
BIOS Features Setup
This setup page includes all the items of Award special enhanced features.
Chipset features setup
This setup page includes all the items of chipset special features.
Power Management setup
This category determines how much power consumption for system after selecting below items..
PNP/PCI Configuration
This category specifies the assignment of all the IRQ’s and DMA’s

PEAK 637 User‘s Guide
BIOS Setup 3-3
Load BIOS defaults
BIOS defaults indicates the most appropriate value of the system parameter which the system would be in
minimum performance. The OEM manufacturer may change the defaults through MODBIN before the binary
image burn into the ROM.
Load setup defaults
Chipset defaults indicates the values required by the system for the maximum performance. The OEM
manufacturer may change to defaults through MODBIN before the binary image burn into the ROM.
Integrated Peripherals
This category allows you to set up all the on board I/O controllers like IDE, SCSI, FDC, etc,.
Supervisor/User Password
Change, set, or disable password of supervisor or user. It allows you to limit access to the system and Setup,
or just to Setup.
IDE HDD auto detection
Automatically configure hard disk parameters.
Save & exit setup
Save CMOS value changes to CMOS and exit setup.
Exit without save
Abandon all CMOS value changes and exit setup.

PEAK 637 User‘s Guide
BIOS Setup 3-4
Standard CMOS Setup Menu
The items in Standard CMOS Setup Menu are divided into 10 categories. Each category includes no, one or
more than one setup items. Use the arrow keys to highlight the item and then use the <PgUp> or <PgDn>
keys to select the value you want in each item.
Date
The date format is <day>, <date> <month> <year>. Press <F3> to show the calendar.
day The day of week, from Sun to Sat, determined by the BIOS, is read only
date The date, from 1 to 31 (or the maximum allowed in the month), can key in the
numerical / function key
month The month, Jan through Dec
year The year, depend on the year of BIOS
Time
The time format is <hour> <minute> <second>. which accepts both function key or numerical key The time is
calculated based on the 24-hour military-time clock. For example, 1 p.m. is 13:00:00.
Primary Master/Primary Slave/Secondary Master/Secondary Slave
The categories identify the types of 2 channels that have been installed in the computer.
If a hard disk has not been installed select NONE and press <Enter>.
Drive A type/Drive B type
The category identifies the types of floppy disk drive A or drive B that have been installed in the computer.
None No floppy drive installed
360K, 5.25 in 5-1/4 inch PC-type standard drive; 360 kilobyte capacity
1.2M, 5.25 in 5-1/4 inch AT-type high-density drive; 1.2 megabyte capacity
720K, 3.5 in 3-1/2 inch double-sided drive; 720 kilobyte capacity
1.44M, 3.5 in 3-1/2 inch double-sided drive; 1.44 megabyte capacity
2.88M, 3.5 in 3-1/2 inch double-sided drive; 2.88 megabyte capacity
Floppy 3 Mode Support:
The category determines whether the floppy 3 mode support is enabled or not.

PEAK 637 User‘s Guide
BIOS Setup 3-5
LCD&CRT:
On board VGA select display type.
Type Function
CRT Boot from CRT only
LCD Boot on LCD only
BOTH Boot both LCD and CRT
AUTO Boot on CRT or LCD
Error halt
The category determines whether the computer will stop if an error is detected during power up.
No Errors Whenever the BIOS detects a non-fatal error the system will be stopped and you will be
prompted.
All Errors The system boot will not be stopped for any error that may be detected.
All, But Keyboard The system boot will not stop for a keyboard error; it will stop for all other errors.
All, But Diskette The system boot will not stop for a disk error; it will stop for all other errors.
All, But Disk/Key The system boot will not stop for a keyboard or disk error; it will stop for all other errors.
Memory
The category is display-only which is determined by POST (Power On Self Test) of the BIOS.
Base Memory
The POST of the BIOS will determine the amount of base (or conventional) memory installed in the system.
The value of the base memory is typically 512K for systems with 512K memory installed on the motherboard,
or 640K for systems with 640K or more memory installed on the motherboard.
Extended Memory
The BIOS determines how much extended memory is present during the POST. This is the amount of
memory located above 1MB in the CPU's memory address map.
Other Memory
This refers to the memory located in the 640K to 1024K address space. This is memory that can be used for
different applications. DOS uses this area to load device drivers to keep as much base memory free for
application programs. Most use for this area is Shadow RAM.
Total Memory
System total memory is the sum of basic memory, extended memory, and other memory.

PEAK 637 User‘s Guide
BIOS Setup 3-6
BIOS Features Setup Menu
Virus Warning
This category flashes on the screen. During and after the system boots up, any attempt to write to the boot
sector or partition table of the hard disk drive will halt the system and the following error message will appear,
in the mean time, you can run an anti-virus program to locate the problem.
! WARNING !
Disk boot sector is to be modified
Type "Y" to accept write or "N" to abort write
Award Software, Inc.
Enabled Activates automatically when the system boots up causing a warning message to appear when
anything attempts to access the boot sector or hard disk partition table.
Disabled No warning message to appearwhen anything attempts to access the boot sector or hard disk partition
table.
Note: This function is available only for DOS and other OSes that do not trap INT13.
CPU Internal Cache/External Cache
These two categories speed up memory access. However, it depends on CPU/chipset design. The default
value is Enabled. If your CPU has no Internal Cache then this item “CPU Internal Cache” will not be shown.
Enabled Enable cache
Disabled Disable cache
CPU L2 Cache ECC Checking
This category could turn on the ECC of Pentium III L 2 Cache or just disable it.
Enabled Enable L2 ECC
Disabled Disable L2 ECC

PEAK 637 User‘s Guide
BIOS Setup 3-7
Quick Power On Self Test
This category speeds up Power On Self Test (POST) after you power on the computer. If it is set to Enabled,
BIOS will shorten or skip some check items during POST.
Enabled Enable quick POST
Disabled Normal POST
Boot Sequence
This category determines which drive computer searches first for the disk operating system (i.e., DOS).
Default value is A,C.
A, C, SCSI Default
C, A, SCSI
C, CDROM, A
CDROM, C, A
D, A, SCSI
E, A, SCSI
F, A, SCSI
SCSI, A, C
SCSI, C, A
C only
LS/ZIP, C
Swap Floppy Drive
This item allows you to determine whether enable the swap floppy drive or not.
The choice: Enabled/Disabled.
Boot Up Floppy Seek
During POST, BIOS will determine if the floppy disk drive installed is 40 or 80 tracks. 360K type is 40 tracks
while 760K, 1.2M and 1.44M are all 80 tracks.
Enabled BIOS searches for floppydisk drive to determine if it is 40 or 80 tracks. Note that BIOS can not tell
from 720K, 1.2M or 1.44M drive type as they are all 80 tracks.
Disabled BIOS will not search for the type of floppy disk drive by track number. Note that there will not be
any warning message if the drive installed is 360K.
Boot Up NumLock Status
The default value is On.
On Keypad is number keys
Off Keypad is arrow keys
Gate A20 Option
Normal The A20 signal is controlled by keyboard controller or chipset hardware.
Fast Default : Fast. The A20 signal is controlled by Port 92 or chipset specific method.
Typematic Rate Setting
This determines the typematic rate.
Enabled Enable typematic rate and typematic delay programming
Disabled Disable typematic rate and typematic delay programming. The system BIOS will use
default value of this 2 items and the default is controlled by keyboard.

PEAK 637 User‘s Guide
BIOS Setup 3-8
Typematic Rate (Chars/Sec)
6 6 characters per second
8 8 characters per second
10 10 characters per second
12 12 characters per second
15 15 characters per second
20 20 characters per second
24 24 characters per second
30 30 characters per second
Typematic Delay (Msec)
When holding a key, the time between the first and second character displayed.
250 250 msec
500 500 msec
750 750 msec
1000 1000 msec
Security Option
This category allows you to limit access to the system and Setup, or just to Setup.
System The system will not boot and access to Setup will be denied if the correct password is not entered
at the prompt.
Setup The system will boot, but access to Setup will be denied if the correct password is not entered at
the prompt.
Note: To disable security, select PASSWORD SETTING at Main Menu and then you will be asked to enter
password. Do not type anything and just press <Enter>, it will disable security. Once the security is disabled,
the system will boot and you can enter Setup freely.
PCI/VGA Palette Snoop
Enable PCI controller support PCI/VGA palette snoop or not, if enabled, VGA cycle will transfer to ISA bus. If
disabled, VGA cycle only transfer to PCI bus.
OS Select for DRAM 64MB
This segment is specifically created for OS/2 when DRAM is larger than 64MB. If your operating system is
OS/2 and DRAM used is larger the 64MB, you have to select “OS 2”, otherwise, non-OS2, default is
NON-OS2.
Video BIOS Shadow
It determines whether video BIOS will be copied to RAM, however, it is optional from chipset design. Video
Shadow will increase the video speed.
Enabled Video shadow is enabled
Disabled Video shadow is disabled
C8000 - CFFFF Shadow/D8000 - DFFFF Shadow
These categories determine whether optional ROM will be copied to RAM by 16K byte or 32K byte per/unit and
the size depends on chipset.
Enabled Optional shadow is enabled
Disabled Optional shadow is disabled