Updated: Tuesday, March 25, 1997

Contents

• Jumper Locations and Definitions
• CPU Configuration
• Other Jumpers

Jumper Locations and Definitions

Function     		Jumper Block        Configuration
        

PSWD			J4L1(A)		* 1-2 Keep (Password Enabled)
(Password Clear)         		2-3 CLR (Password Clear/Disabled)

CMOS			J4L1(A)         * 4-5 Keep (normal)
(CMOS [NVRAM and ESCD] Clear) 		5-6 CLR (reset to default settings)

SETUP			J4L1(B)         * 1-2 ENBL (Access Allowed)
(CMOS Setup Access)            		2-3 DIS (Access Denied)

Host Bus Freq.		J4L1(C)         See Processor Configuration
(As shipped. These jumpers also set PCI,and ISA clock speeds.)  
   
Bus Multiplier		J4L1(D)         See Processor Configuration
(Processor Frequency)  

RISER          		J4G1            * 1-2 & 4-5 (Two slots)
(Select # of PCI slots on riser)        2-3 & 5-6 (Three slots)


BIOS Recovery		J6C2            * 1-2 NORM (Normal operation)
		                        2-3 RCVR (Recover Flash)

Processor Voltage	J6C2            * 4-5 VR voltage (VR, default) 
(as shipped)				5-6 VRE coltage (VRE)

*  Default configuration

Processor Configuration - Jumper Block J4L1 (C&D)
The motherboard must be configured for the frequency of the installed processor. The following table shows the jumper settings for each frequency and the corresponding host bus, PCI bus, and ISA bus frequencies.

Processor Freq.(MHz)	Jumpers J4L1C	Jumpers J4L1D	Host Bus Freq. (MHz)	PCI Bus Freq. (MHz)	ISA Bus Freq. (MHz)	Bus/Processor Freq. Ratio
200	1-2 and 5-6	1-2 and 5-6	66	33	8.33	3
166	1-2 and 5-6	2-3 and 5-6	66	33	8.33	2.5
150	2-3 and 4-5	2-3 and 5-6	60	30	7.5	2.5
133	1-2 and 5-6	2-3 and 4-5	66	33	8.33	2
120	2-3 and 4-5	2-3 and 4-5	60	30	7.5	2
100	1-2 and 5-6	1-2 and 4-5	66	33	8.33	1.5
90	2-3 and 4-5	1-2 and 4-5	60	30	7.5	1.5
75	2-3 and 5-6	1-2 and 4-5	50	25	6.25	1.5
reserved	2-3 and 5-6	1-2 and 5-6	--	--	--	--
reserved	1-2 and 4-5	All	--	--	--	--

Other Jumpers

CMOS - J4L1 A PINS 4-6
This jumper resets the CMOS settings to the default values. This procedure must be done each time the system BIOS is updated. The default setting for this jumper is pins 4-5 (keep CMOS settings). To reset the CMOS settings to the default values, turn off the computer, move the jumper to pins 5-6, then turn on the computer. When the computer displays the message "NVRAM cleared by jumper," turn off the computer and return the jumper to pins 4-5 to restore normal operation.

PSWD - J4L1 A PINS 1-3
Use this jumper to clear the password if the password is forgotten. The default setting is pins 1-2, (password enabled). To clear the password, turn off the computer, move the jumper to pins 2-3, and turn on the computer. Then turn off the computer, and return the jumper to pins 1-2 to restore normal operation. If the jumper is in the 2-3 position (password disabled), you cannot set a password.

SETUP - J4L1 B PINS 1-3
This jumper enables or disables access to the Setup program. The default setting is pins 1-2 (access enabled). To disable access to the Setup program, move the jumper to pins 2-3.

RISER - J4G1
The riser jumper block allows routing of an extra IRQ and ID select to the riser card for an additional PCI slot to support a maximum of 3 PCI slots on a riser. Default is set for 2 PCI slots on the riser card (1-2 position and 4-5 position).

Processor Voltage - J6C2
This jumper sets the output of the onboard voltage regulator. For processors that require VR voltage (nominally +3.3 volts), place the jumper on pins 4-5. For processors that require VRE voltage, place the jumper on pins 5-6. Voltage specifications are as follows: VR = 3.3 - 3.465 V, VRE = 3.465 - 3.63 V

Caution: When installing a processor in the motherboard for the first time or upgrading to a new processor, check the processor's documentation for the correct voltage setting.

Recovery Jumper - J6C2
This jumper lets you recover the BIOS data from a diskette in the event of a catastrophic failure. The default setting is pins 1-2 (normal operation). To recover the BIOS, turn off the computer, move the jumper to pins 2-3, then turn on the computer to perform BIOS recovery. After recovery, turn off the computer and return the jumper to pins 1-2 to restore normal operation.

2/3 PCI Slot Select - J4G1
These jumper settings define the number of PCI slots available in the riser board. Jumpers installed at J4G1 pins 1-2 and 4-5 indicate that the installed riser board has just two PCI slots available. Jumpers installed at J4G1 pins 2-3 and 5-6 indicate that the installed riser board has three PCI slots available.