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Advanced/AS Jumper Settings

Updated: Wednesday, June 12, 1996

Contents

Jumper Locations and Definitions
Microprocessor Configuration

Jumper Locations and Definitions

Function Jumper Block

Internal CPU Clock Speed J8F2 & J1N1 External CPU Clock Speed J8F1 Voltage Regulator Output J8F2 CMOS Setup Disable J7F2 Clear CMOS J7F2 ISA Bus Clock J7F1 Password Clear J7F1 Recovery J1N1

Microprocessor Configuration

Internal CPU Clock Speed (Jumpers J8F2 & J1N1)
This jumper sets the internal CPU clock speed to either 3/2 (OFF) or 2x (ON) the external CPU clock speed.

CPU Clock Multiplier	J8F2	J1N1
1.5x	1-2	4-5
2.0x	2-3	4-5
2.5x	2-3	5-6
3.0x	1-2	5-6

Note: The Advanced/AS does not support recovery, however J1N1 must be strapped from pins 1-2 to work properly. If the jumper is either moved from pins 1-2 or removed, the system will fail to boot properly.

External CPU Clock Speed (Jumper J8F1)
This jumper block sets the CPU's external operating frequency to memory at 50, 60, or 66 MHz. Default setting depends on the specific product code, see the table below for specific Pentium processor configuration information.

External Bus Freq.	Jumper J8F1
50 MHz	1-2, 5-6
60 MHz	1-2, 4-5
66 MHz	2-3, 5-6
Reserved	2-3, 4-5

Jumper Settings for CPU Speed Support
This combination of the above two tables defines the speed of the processor. The following table simply combines these two settings into a processor support table for convenience.

External Bus Speed	Bus Clock Multiplier	Processor Speed	Jumper J8F1	Jumper J8F2	Jumper J1N1
50	1.5	75	1-2, 5-6	1-2	4-5
60	1.5	90	1-2, 4-5	1-2	4-5
66	1.5	100	2-3, 5-6	1-2	4-5
60	2	120	1-2, 4-5	2-3	4-5
66	2	133	2-3, 5-6	2-3	4-5
60	2.5	150	1-2, 4-5	2-3	5-6
66	2.5	166	2-3, 5-6	2-3	5-6
66	3.0	200	2-3, 5-6	1-2	5-6

VR/VRE (Jumper J8F2)
This jumper block changes the output of the on-board voltage regulator. Pins 4-5 in J8F2 should be jumpered for standard voltage regulation, pins 5-6 in J8F2 should be jumpered for the VRE specification. This jumper should not be changed by the user unless changing to a new processor type. Some upgrade processors may require a different setting, check the processor's documentation for the correct setting. (Standard = 3.135-3.465V, VRE = 3.465-3.63V)

Setup Disable (Jumper J7F2)
Allows access to CMOS Setup Utility to be disabled by jumpering pins 2-3 in J7F2. Default is for access to setup to be enabled, jumpers on 1-2.

Clear CMOS (Jumper J7F2)
Allows CMOS settings to be reset to default values by jumpering pins 5-6in J7F2. The system should then be turned off and the jumper returned to pins 4-5 to restore normal operation. This procedure should be done whenever the system BIOS is updated.

ISA Bus Clock (Jumper J7F1)
This jumper changes the clock frequency of the ISA bus. The effect of this jumper on the ISA clock depends upon the setting of the CPU clock speed jumpers. The default setting for this jumper is 1-2. In general, this jumper should only be set to 2-3 if higher ISA performance is required, and the ISA expansion cards can handle the faster bus clock.

Bus Frequency	Jumper J7F1	ISA Bus Speed
50 MHz	1-2 or 2-3	8.33 MHz
60 MHz	1-2 2-3	7.5 MHz 10 MHz
66 MHz	1-2 2-3	8.25 MHz 11 MHz

Password Clear (Jumper J7F1)
Allows system password to be cleared by jumpering pins 5-6 in J7F1 and turning the system on. The system should then be turned off and the jumper should be returned to 4-5 in J7F1 to restore normal operation. This procedure should only be done if the user password has been forgotten.

Recovery (Jumper J1N1)
Due to BIOS space limitations in the Flash component on the Advanced/AS, the BIOS support for recovery has been removed. The silk screen for the jumper at J1N1 erroneously implies that there is recovery support. If you have a problem wherein you are unable to make your system operational due to severe BIOS corruption, and the only means of correction is a flash recovery, please contact your vendor for special recovery tools.