Intel 281786-002 manual Appendix B − Jumpers and Switches

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Appendix B − Jumpers and Switches

Figure B-1. Jumper locations and settings (default settings shown)

EXTERNAL CPU CLOCK SPEED (50/60/66 MHZ) - SWITCHES 7 & 8

This jumper sets the CPU's external operating frequency at 50, 60, and 66 MHz.. Default setting is 50 MHz.

Frequency	Switch 7	Switch 8
50 MHz	OFF	OFF
60 Mhz	ON	OFF
66 MHz	OFF	ON

Table B-1. External CPU Speed Switches

INTERNAL CPU BUS CLOCK SPEED - SWITCH 6

Sets the internal processor speed to either 3/2 or 2 times the external CPU clock speed. Switch 6=OFF for 3/2, Switch 6=ON for 2 times. The 3/2 setting is used for 75 MHz, 90 MHz, and 100 MHz processors. The 2 times setting is used for 120 MHz processors. The default setting is 3/2, (Switch 6 = OFF).

SETUP DISABLE - SWITCH 5

Allows access to CMOS Setup Utility to be disabled by setting switch 5 to the ON position. Default is for access to setup to be enabled (switch 5 = OFF).

CLEAR CMOS - SWITCH 4

Allows CMOS settings to be reset to default values by moving switch 4 to the ON position and turning the system on. The system should then be turned off and switch 4 should be returned to the OFF position to restore normal operation. This procedure should be done whenever the system BIOS is updated. Default setting is SW4=OFF.

PASSWORD CLEAR - SWITCH 3

Allows system password to be cleared by moving switch 3 to the ON position and turning the system on. The system should then be turned off and switch 3 should be returned to the OFF position to restore normal operation. This procedure should only be done if the user password has been forgotten. Default setting is SW3=OFF.

Advanced/ZP Technical Product Summary ∙Page 15

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Contents Advanced/ZP Baby-AT Board Table of Contents ADVANCED/ZP Form Factor IntroductionJUMPERS/SWITCHES Baseboard DimensionsMounting Hole Placement Front Panel ConnectorsSecond Level Cache Board Level FeaturesPerformance Upgrade CPUPCI 3.3 Volt Capabilities System MemoryEDO Dram Expansion Slots82371FB PCI ISA/IDE Accelerator Piix Peripheral Component Interconnect PCI Pciset82437FX Triton System Controller TSC 82438FX Triton Data Path TDPKeyboard Interface Real Time CLOCK, Cmos RAM and BatteryIDE Support National Semiconductor 87306 Super I/O ControllerFlash Implementation System BiosBios Upgrades Irda Infrared SupportISA Plug & Play Setup UtilityPCI AUTO-CONFIGURATION Power ManagementConnectors Security Features Power Consumption Back Panel Connections Connections Watts CurrentAppendix a − User-Installable Upgrades RTC BatterySimm 1,2 Bank Simm 3,4 Bank Total System Memory Appendix B − Jumpers and Switches Processor Voltage Regulation Switch ISA BUS Speed SwitchRecovery Boot Enable J1K1 PCI Configuration Space MAP Appendix E − Interrupts & DMA Channels Appendix D − Memory MapAppendix F − Connectors Power Supply Connectors Primary Power J9J1Front Panel Connectors − J2A1, J1B1 Parallel Port j9e1 AT Keyboard Connector J8k1FLoppy Connector j9c1 Serial Ports j7k1, j7k2ISA Connectors J1G1, J2G1, J2G2, J3G1 PCI Connectors J4G1, J5G1, J5G2 Main Screen Appendix G − Bios SetupOverview of the Setup Menu Screens Overview of the Setup KeysFloppy Options Submenu Hard Disk Configuration SubmenuNumber of Cylinders Initialization TimeoutIDE Translation Mode Multiple Sector SettingBoot Options Submenu Advanced Screen Peripheral Configuration SubmenuFloppy Interface Serial Port 2 IR ModeParallel Port Mode PCI IDE InterfacePower Management Configuration Advanced Chipset Configuration SubmenuPlug and Play Configuration Submenu Administrative and User Access Modes Security ScreenSecurity Screen Options Exit Screen Appendix H − Bios Recovery Using the Upgrade UtilityRecovery Mode Appendix I − Error messages and Beep Codes Error MessagesBeep Codes ISA NMI Messages Plug and Play Error MessagesAppendix K − Reliability Data Appendix J − Environmental Standards