Dual Pentium^® II
System Board Technical Reference

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Specifications The following specifications are for the standard configuration; your system may contain optional equipment. All Specifications are subject to change without notice or obligation. Desktop case 17 × 16.25 × 6.5 (W×D×H) Mid-tower case 9.87 × 18.64 × 22.8 (W×D×H), including base CPU Intel Pentium® II with MMX™ Technology CPU speed 233MHz, 266MHz and 300MHz Cache subsystem 512KB RAM capacity 168-pin Sync DRAM (SDRAM) memory. Four slots. 16MB minimum expandable to 512MB SDRAM. BIOS Phoenix BIOS: Flash BIOS for easy updates from floppy disk IDE interfaces Supports up to four IDE devices (hard drives or CD-ROMs) using two on-board PCI IDE connectors; automatic drive type selection for easy setup Diskette drive A floppy controller is integrated on the system board. Support available for primary and secondary diskette drives and a TBU (Tape Backup Unit). I/O ports One parallel and two serial ports on system board; LPT and COM configurable from system setup program; no jumper settings required USB Universal Serial Bus (2 ports) Mouse PS/2 mouse connector Keyboard PS/2 keyboard connector AGP expansion slot One slot (dedicated for graphics/video) ISA expansion slots Two (one slot is shared with PCI) PCI expansion slots Four (one slot is shared with ISA) SCSI Subsystem Adaptec AIC-7895 Power supply 300 watts; PS/2 with ATX-style power connector System environment Internal temperature: 10°C to 35°C Humidity: 20% to 80% Altitude: -200 ft. to 10,000 ft. Shock, vibration: 12g, 11ms half-sine; 2 to 200Hz, 0.25g sinusoidal CPU clearance: >0.4 inch after installation, top and sides Certification FCC Class B, UL, CUL, CE Mark, VCCI, CB Scheme Many Gateway 2000 products are custom engineered by our suppliers to Gateway 2000 specifications, and may vary with similarly marketed products.   About the BIOS Setup Utility Your computer’s BIOS has a built-in program that lets you set many basic system characteristics. These settings are stored and saved even when the power is off. This chapter contains information about this setup utility and is intended to serve as a guide so that you can make changes to your system’s BIOS when necessary. Note: Many of the screen examples in this chapter will be identical to what is on your monitor; however, you may have a system with a newer BIOS version than described in this manual. Some of the examples may differ somewhat, but the screens will be similar enough to get the information you need.   Using BIOS Setup When you start your computer, a screen shows the progress of the startup as the system loads the operating system and checks to ensure that your computer is operating correctly. Soon after the startup begins, the prompt Press <F1> key if you want to run Setup appears. After you press <F1>, the BIOS Setup program main screen opens. Note the menu bar, the command bar, and the Item Specific Help box. BIOS Setup Utility  Main   Advanced   Security   Power   Boot   Exit Item Specific Help Processor Type Processor Speed Cache Ram Total Memory BIOS Version Language: System Time: System Date: >Floppy Options >Primary IDE Master >Primary IDE Slave >Secondary IDE Master >Secondary IDE Slave   Pentium ® II 233 MHz 512 KB 32 MB 4D4KL0X0.15A.0000.D [English (US)] [15:25:05] [06/01/1997] [WDC AC2340] [None] [None] [None] Select the current default language used by BIOS   F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit As you select various items on the main menu and in submenus, you will see specific information related to the selection in the Item Specific Help box. Information in this box supplements the information in this manual. Pressing the keys shown on the command bar moves you around in the setup screens and invokes commands in the setup program. <F1> opens the Help screen, providing general help for using the BIOS Setup utility. The up and down arrows select items in the menu. The horizontal arrows move you between the six major menus. <Enter> either moves you to a submenu screen when a selected item is preceded by > or activates a selected field. The plus <+> and minus <-> keys change values in fields or move an item up or down in a list. <Esc> closes the screen you are in and returns you to the previous screen. <F9> opens a screen that lets you return all values to their default settings. <F10> opens a screen that lets you save all parameters and then exit Setup. The main screen has main menu selections at the top of the screen: Main gives you access to basic information and settings related to your system hardware and configuration. Advanced gives you access to information and settings for system resources, hardware, and system configuration. Security gives you access to settings related to system access passwords. Power gives you access to information and settings related to power saving functions available with your system. Boot gives you access to settings that determine how your computer starts up. Exit gives you access to options for exiting the BIOS Setup utility.   Main menu The main menu screen contains items that relate to the major hardware and system BIOS settings on your computer. BIOS Setup Utility  Main   Advanced   Security   Power   Boot   Exit Item Specific Help Processor Type Processor Speed Cache Ram Total Memory BIOS Version Language: System Time: System Date: >Floppy Options >Primary IDE Master >Primary IDE Slave >Secondary IDE Master >Secondary IDE Slave   Pentium ® II 233 MHz 512 KB 32 MB 4D4KL0X0.15A.0000.D [English (US)] [15:25:05] [06/01/1997] [WDC AC2340] [None] [None] [None] Select the current default language used by BIOS   F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit Some of these items are provided solely for your information, while others are editable: Processor Type shows the type of processor installed in the system. Processor Speed shows the processor speed in MHz. Cache RAM shows the amount of cache RAM, in KB, in your system. If the CMOS is cleared, BIOS Setup reports the cache RAM size as 0 until the computer is restarted. Total Memory shows the total of the base and extended memory in your system. BIOS Version shows the version number of the BIOS installed in your system. Language shows the language used for your system. You can change the language to any other language installed in your system by navigating to this menu item, pressing Enter to open the options menu, then selecting a language from the list. System Date and System Time show the system date and time settings. You can change these by navigating to these fields and entering new values using the keyboard. Note that the time is expressed using the 24-hour clock system. For example, 1:00 PM is 13:00:00 in the 24-hour system. Floppy Option lets you select these options for diskette drives: Diskette A and Diskette B let you designate what kinds of diskette drives are installed in your system. You should only change the floppy drive type if you have installed an additional drive, want to disable a diskette drive, of if you need to re-enter CMOS floppy values. (Note that the 1.25 MB, 3 ¾² option refers to a 1024 byte/sector Japanese media format.) Floppy Write Protect lets you enable or disable write protection for the diskettes in installed drives. Primary IDE Master indicates the type of IDE device that is installed as the primary master device. A submenu opens from this menu item with these parameters: Type selects the drive type of the installed drive. If you select type USER, you can edit hard drive cylinders, heads, and sectors. When you select type AUTO, you can only change the 32-bit I/O enable/disable option. Selecting NONE disables an installed device. Cylinders shows the number of cylinders on the drive. Heads shows the number of heads on the drive. Sectors shows the number of sectors on the drive. Maximum Capacity shows the maximum capacity of the drive when the cylinder, head, and sector parameters are entered. Multi-sector transfers determines the number of sectors per block for multiple sector transfers. MAX is the size the disk returns when queried. LBA mode control, when enabled, causes Logical Block Addressing to be used in place of cylinder, head, and sector parameters. Transfer mode selects the method for moving data to and from the drive. Autotype the drive to select the optimum transfer mode. Ultra DMA sets the data transfer rate of the IDE hard drive. Primary IDE Slave indicates the type of IDE device that is installed as the primary slave drive. A submenu opens from this menu item with parameters described in "Primary IDE Master," above. Secondary IDE Master indicates the type of IDE device that is installed as the secondary master drive. A submenu opens from this menu item with parameters described in "Primary IDE Master," above. Secondary IDE Slave indicates the type of IDE device that is installed as the secondary slave device. A submenu opens from this menu item with parameters described in "Primary IDE Master," above.   Advanced menu The Advanced menu screen provides options for configuring further system parameters and devices. BIOS Setup Utility  Main   Advanced   Security   Power   Boot   Exit Item Specific Help Setup Setting items on this values may cause your Plug & Play O/S: Reset Configuration Data: Memory Cache: Version: Route PCI IRQs to I/O APIC: >Resource Configuration >Peripheral Configuration >Keyboard Configuration >Video Configuration >DMI Event Logging   Warning menu to incorrect system to malfunction [NO] [NO] [Enabled] 1.4 [Enabled] Select Yes if you are using a Plug and Play operating system.   If you select Yes and boot to a NON Plug & Play capable operating system, most system devices will NOT be initialized and will NOT function. F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit Caution! Setting items on this menu to incorrect values may cause your system to malfunction. Plug & Play O/S, when set to Yes, takes advantage of plug and play features when using a plug & play operating system. If you select Yes and start up with an operating system that doesn’t support plug & play (like DOS), most system devices will not be initialized and will not function. Set this field to No for proper operation in those situations. Reset configuration data returns all parameters to the original system default values if you select Yes. Memory Cache shows the state of the memory cache. Resource Configuration lets you set the configuration of memory addresses and IRQs in the Memory Reservation and IRQ Reservation submenus. Peripheral Configuration opens a screen that lets you set the configuration for peripheral hardware BIOS Setup Utility             Advanced Peripheral Configuration Item Specific Help Serial port A: Base I/0 address: Interrupt: Serial port B: Mode: Base I/0 address: Interrupt: Parallel port: Mode: Base I/O address: Interrupt: Floppy disk controller: IDE controller:   [Enabled] [3F8] [IRQ 4] [Enabled] [Normal] [2F8] [IRQ 3] [Enabled] [Bi-directional] [378] [IRQ 7] [Enabled] [Both] Configure serial port A   Setting this field to Auto will enable this device, but the BIOS will not place its resources available unless Plug & Play O/S is set to No.   *<- Indicate that the selected device is in conflict with another device F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit Serial port A and Serial port B let you configure these serial ports. Setting these fields to AUTO enables these devices, but the BIOS will not place its resources unless Plug & Play O/S is set to No. An asterisk next to one of these selections indicates that the selected device is in conflict with another device. The Mode sub-setting for serial port B sets the mode to ASK-IR, IRDA, or Normal. Parallel port lets you configure the parallel port. Setting this field to AUTO enables this device, but the BIOS will not place its resource unless Plug & Play O/S is set to No. An asterisk next to this selection indicates that the device in is conflict with another device. The Mode sub-setting sets the mode for the parallel port to output only, bidirectional, EPP, or ECP. Floppy disk controller enables or disables the integrated floppy disk controller. IDE controller configures the integrated IDE controller. The settings options are Both, Secondary, Primary, and Disabled. Keyboard Configuration opens a screen that provides settings for key repeat and number keypad options. BIOS Setup Utility             Advanced Keyboard Configuration Item Specific Help Numlock: Keyboard auto-repeat rate: Keyboard auto-repeat delay:   [Auto] [30/sec] [1/2sec] Selects Power-on state for Numlock F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit Numlock settings determine if the keyboard’s number keypad will be locked on at startup. Settings options are On, Off, and Auto. Auto sets Numlock to the condition the keypad was in the last time the system was shut down. Keyboard auto-repeat rate sets how fast a key will repeat typing when held down. Keyboard auto-repeat delay sets how long a key must be held down before the auto-repeat function starts. Video Configuration opens a screen that lets you change video functions. BIOS Setup Utility             Advanced Video Configuration Item Specific Help Pallette snooping:   [Disabled] PCI devices may need to know if an ISA graphics device is installed in the system in order to enable the card to function correctly. If you are using an ISA graphics card, you may need to set this value to Enabled. F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit Palette snooping lets you enable or disable this function, which lets PCI devices know if an ISA graphics device is installed in the system. This is necessary to enable PCI devices to function correctly. If you are using an ISA graphics card, you may need to set this field to Enabled. DMI event logging opens a screen that displays and lets you view or delete DMI (Desktop Management Interface) event logs. BIOS Setup Utility             Advanced DMI Event Logging Item Specific Help Event log capacity: Event log validity: View DMI event log: Clear all DMI event logs: Event logging: ECC event logging: Mark DMI events as read:   Space Available Valid [Enter] [No] [Enabled] [Disabled] [Enter] View the contents of the DMI event log F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit Caution! Setting items on this menu to incorrect values may cause your system to malfunction. Event log capacity shows you if there is enough space for event logs. Event log validity shows if event logging is a valid option. View DMI event log opens a screen showing the DMI events. Clear all DMI event logs erases the information in all DMI event logs when restarting, if you have selected Yes. Event logging lets you enable or disable logging of DMI events. ECC event logging lets you enable or disable logging of ECC (Error Correcting Code) events (only applicable to systems with parity memory). Mark DMI events as read marks all DMI events in the event log as read when you press <Enter>.   Security menu The Security menu screen provides access to passwords and security options for your system. BIOS Setup Utility  Main   Advanced   Security   Power   Boot   Exit Item Specific Help User Password Is: Supervisor Password Is: Set User Password Set Supervisor Password Unattended Start   Clear Clear [Enter] [Enter] [Enabled] User Password controls access to the system at boot.   F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit User Password Is shows the current user password. The password is not editable in this field. Supervisor Password Is shows the current supervisor password. The password is not editable in this field. Set User Password lets a user enter and confirm a password for the system. Set Supervisor Password lets the supervisor enter and confirm a password for the system. Unattended Start starts and runs the system, but locks the keyboard if a password is set but has not been entered in the startup screen. Entering a password in the startup screen unlocks the keyboard. A password is also required to start the system using a diskette. Note: If you forget your password, you can clear all system passwords using the J8B2 jumper. See the "Jumper settings" section in this manual for further information.   Power menu The Power menu provides options for setting various power-saving features of your system that manage the power consumed by the CPU, IDE drives, the monitor, and graphics cards. BIOS Setup Utility  Main   Advanced   Security   Power   Boot   Exit Item Specific Help Power Management: Fan Always On: Inactivity Timer: Hard Drive: VESA Video Power Down:   [Enabled] [No] [16 Minutes] [Enabled] [Enabled] Enable or disable the BIOS power management feature.   F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit Power Management lets you enable or disable BIOS power management. Fan Always On lets you designate if the fan should be on or off when the system is in suspended mode. Inactivity Timer lets you designate if you want the standby mode to activate and, if so, how long the system must be inactive before the standby mode starts. Standby mode shuts down various devices in the system until you use the computer again. Hard Drive lets you designate if the hard drive should be managed while your computer is in Standby or Suspend mode. VESA Video Power Down lets you enable or disable VESA power down for the monitor when your computer is in Standby or Suspend mode. Note: Enabling Power Management also enables the Fast Start Mode feature of this system board. Fast Start Mode allows you to put the computer into a "power save" (sleep) mode by pushing the power button. The computer appears to be completely off. Pushing the power button again, moving the mouse, or using the keyboard will "wake-up" the computer with no data loss. The table below summarizes the operation of the power button. These instructions are also noted on the sticker on the front of your case. System Status From To Action LED (Power) Off On Push power button Green On Sleep Push power button Amber Sleep On Push power button Green On Off Push and hold the power button for five seconds Off   To reset your computer with PM enabled: Push the power button and hold for five seconds. Push the power button again to turn on the computer. If Power Management is disabled, the power button functions normally to start up or shut off the computer. Press <Ctrl>, <Alt> and <Delete> at the same time to reset the computer. If this does not work, push and hold the power button for five seconds to shut off the computer. Push and hold the power button for five seconds during the boot process to shut off the computer.   Boot menu The Boot menu screen contains items that you can select to set several parameters that affect the computer’s startup. For the Boot Device items, the default boot device order is Floppy, 1st IDE HD, then CD-ROM or Disabled. BIOS Setup Utility  Main   Advanced   Security   Power   Boot   Exit Item Specific Help RestoreOnAC/PowerLoss: On Modem Ring: On LAN: On PME: First Boot Device: Second Boot Device: Third Boot Device: Fourth Boot Device: >Hard Drive >Removable Device   [Last State] [Power On] [Power On] [Power On] [ATAPI CD-ROM Device] [Removeable Devices] [Hard Drives] [Network Boot] Sets the mode of operation if an AC/Power loss occurs. The three power modes are: Stay Off keeps the power off untill the power button is pressed. Last State restores the previous power state before loss occurred. Power On restores power to the system. F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit Restore on AC/Power Loss sets the mode of operation if there is a loss of power. Stay Off keeps the power off until you press the power button. Last State restores the previous power state before the power went off. Power On automatically restores power to the system when power returns. On Modem Ring controls how the system responds to an incoming call with an external modem and when the system is off. Power On starts the system to answer the call. Stay Off keeps the power off. On LAN controls how the system responds to a LAN wakeup event. On PME controls how the system responds to a PCI Power Management Enable wakeup event. First Boot Device lets you select the device that starts first when the power comes on. Select the device by using the up and down arrow keys, then move the device up the list by pressing <+> and down the list by pressing <->. Second Boot Device lets you select the device that starts immediately after the first boot device starts. Third Boot Device lets you select the device that starts immediately after the second boot device starts. Fourth Boot Device lets you select the device that starts immediately after the third boot device starts. Hard Drive opens a screen listing the hard drives installed in the system. BIOS Setup Utility Boot Hard Drive Item Specific Help 1. [Bootable ISA Cards] 2. [WDC AC2340]   To select the boot device, use the up and down arrows, then press <+> to move the device up the list, or <-> to move it down the list. Press <Esc> to exit this menu. F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit If the system does not find an operating system on one of the boot devices listed in the first through fourth Boot Device settings, it will try to boot to the first hard drive in this list. If no operating system is found there, the system will try the next drive listed, and so on. If no hard drive with an operating system is found, the system then looks in the list of removable devices for the first device containing an operating system. You can select which boot device is first by using the up and down arrows to select devices, then moving them up or down the list by typing plus <+> to move them up the list, or minus <-> to move them down the list. Removable Devices opens a screen that lists the removable devices installed in your system. BIOS Setup Utility Boot Removable Devices Item Specific Help 1. [Legacy Floppy Drives]   To select the boot device, use the up and down arrows, then press <+> to move the device up the list, or <-> to move it down the list. Press <Esc> to exit this menu. F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit You can change the sequence, and therefore the drive letters, for these devices by pressing the plus sign <+> to move up the list, or minus <-> to move down the list.   Exit menu The Exit menu lets you choose how you want to exit BIOS Setup and save your changes. BIOS Setup Utility  Main   Advanced   Security   Power   Boot   Exit Item Specific Help Exit Saving Changes Exit Discarding Changes Load Setup Defaults Load Custom Defaults Save Custom Defaults Discard Changes   Exit System Setup and save your changes to CMOS.   F1 Help     ­¯ Select Item     -/+ Change Values     F9 Setup Default ESC Exits   ¬® Select Menu   Enter Select > Sub-Menu   F10 Save and Exit Exit Saving Changes closes the setup utility and saves any changes you’ve made. Exit Discarding Changes closes the setup utility without saving any of your changes. Load Setup Defaults sets all parameters to their original values set at system manufacture. Load Custom Defaults loads system values that you have previously changed and saved. Save Custom Defaults saves changes you have made to the CMOS parameters and designates them as the custom default set. Discard Changes discards any changes you’ve made to the setup parameters since you started the BIOS Setup utility, but does not close the utility.   Removing the cover Computers emit radio frequency energy that can interfere with television and radio reception if not contained. Do not operate the computer with the cover removed. Before opening your system case, read and follow these preventions and precautions to prevent damage from static electricity. Caution! Preventing Static Electricity Damage The components inside your system are extremely sensitive to static electricity, also known as electrostatic discharge (ESD). Static electricity can cause irreparable damage to your system; however, if you follow these preventions and precautions, you should prevent such damage. Static Electricity Preventions WEAR A GROUNDING WRIST STRAP (available at most electronic stores). Turn off the system power. Touch the back of the power supply fan, located on the back of the case. UNPLUG ALL CORDS FROM WALL OUTLET. Remove the system case cover. Static Electricity Precautions Avoid static-causing surfaces such as plastic and styrofoam in your work area. Remove parts from their antistatic bags only when you are ready to use it. Do not lay parts on the outside of antistatic bags since only the inside provides antistatic protection. Always hold cards by their edges and their metal mounting bracket. Avoid touching components on the cards and the edge connectors that connect to expansion slots. Never slide cards or other parts over any surface.   To remove the cover: Follow the static electricity preventions and precautions. Remove the screws that hold the cover in place. Refer to the user’s guide that shipped with your system for instructions. Do not remove any other screws. Carefully remove the cover. When you replace the cover, be careful not to remove or damage any brass tabs that may be around the edge of the unit, and do not catch the cover on any cables inside the unit.   Expansion slots and cards The system board has seven expansion slot connectors. One AGP (Accelerated Graphics Port) expansion slot connector, dedicated for graphics/video. Two ISA-bus 8/16-bit expansion slot connectors. Four 32-bit PCI local bus interface expansion slot connectors. The ISA connector and PCI connector next to each other share a slot location. You can use one or the other, but not both. The maximum number of slots that can be filled is six.   Installing expansion cards Two types of expansion cards are available: ISA cards and PCI cards. Many ISA expansion cards have jumpers or switches that set interrupts and I/O addresses. They also have instructions that explain how to set them to avoid conflicts. Follow these instructions carefully! If you install a PCI card, simply plug it in. Refer to the system board illustration on the next page for the proper installation location. The system configures the card for you.   To install an ISA expansion card: Set any jumpers and switches on the card as described in the card’s instructions. Shut down the system and remove the cover. Lay the unit on its side if you have a mid-tower system to make access to the interior easier. Locate a free expansion slot. Remove the screw securing the expansion port cover to the rear panel. Keep the port cover to reinstall if you ever remove the card. Seat the expansion card firmly in the slot. Secure the card to the rear panel with the screw removed in step 5. Attach any cables according to the card’s instructions. Replace the system unit cover. Install any software the card may require.   System board connectors ISA expansion slot connectors (two) Heceta hardware monitoring chip PCI expansion slot connectors (four) AGP expansion slot connector Main CPU fan connector Back panel I/O connectors Power supply fan control connector Pentium II primary processor connector (bootstrap processor) Power connector Pentium II secondary processor connector (application processor) Memory/AGP/PCI controller Secondary CPU fan connector SCSI RAID controller slot DIMM sockets Maintenance mode/recovery jumper Secondary IDE connector Voltage regulator Voltage regulator Primary IDE connector Diskette drive connector Intel 82371AB PCIset (PIIX4) Ultra-Wide SCSI channel A connector SCSI channel B connector Ultra-Wide SCSI channel B connector SCSI termination enabled jumper Front panel I/O connectors Fan connector Fan connector Built-in speaker Chassis Intruder connector SCSI LED connector Battery SCSI LED Onboard SCSI controller chip Flash ROM Wake on modem connector Super I/O controller chip I/O APIC chip Wake on LAN connector   Back panel I/O connectors PS/2 mouse connector PS/2 keyboard connector USB connectors (two) Serial connector Parallel port Serial connector   Specific system board connections Many features on the system board allow it to function quickly and efficiently. Some of these features are briefly described below.   Battery This external coin-cell style lithium battery supplies power to the integrated RTC (Real Time Clock) and CMOS memory. The battery has an estimated lifetime of seven years and is socketed for easy replacement. When the system is on, power is provided by the power supply to extend the life of the battery.   Voltage regulator (VRE) The VRE supplies the power to the CPU and chipset. Voltage levels are preset at the factory and should not be altered under any circumstances or permanent damage to the CPU and chipset could result.   DIMM sockets A bank consists of one DIMM socket. Four banks are available on the system board. You can fill one or all four banks with DIMM components, in any combination of 8, 16, 32, 64 and 128MB DIMMs totalling up to 512MB of SDRAM. See "Installing memory" for additional information.   Stacked connectors The keyboard, mouse, parallel port, USB, COM1 and COM2 connectors are stacked on this system board.   PAC controller (PCI/AGP) The PAC provides the bus control signals, address paths and data paths for the processor’s host bus, PCI bus, AGP port and main memory. The PAC is a 492-pin BGA (Ball Grid Array) package located between the two processor connectors.   Super I/O controller This component is ISA Plug & Play-compatible and provides control for the integrated serial ports, parallel port, diskette drive and keyboard/mouse controller. The component provides: Two NS16C550-compatible UARTs with internal send/receive 16-byte FIFO Multi-mode bidirectional parallel port in standard, enhanced, and high-speed extended capabilities modes Industry standard floppy controller with 16-byte data FIFO, PC-AT and PS/2 drive mode support, and high performance DDS (Digital Data Separator) Integrated 8042-compatible controller, general purpose microcontroller, and 8-bit internal data bus.   Intel 82371AB PCIset (PIIX4) This component provides the interface between the PCI and ISA buses and the following hardware control for the system: USB Fast IDE Enhanced DMA Interrupt controller. The PIIX4 also provides power management and RTC logic for the system. The PIIX4 is a 324-pin BGA package.   Flash ROM This component serves as the storage area for the BIOS, the Setup utility, POST (Power-On Self Test), update recovery code, and the PCI auto-configuration utility. This baseboard supports system BIOS shadowing, allowing the BIOS to execute from 64-bit on-board write-protected DRAM.   IDE Support This system provides two independent high performance bus mastering PCI IDE interfaces capable of supporting PIO Mode 4 and Ultra ATA devices. The system BIOS supports LBA (Logical Block Addressing) and ECHS (Extended Cylinder Head) translation modes as well as ATAPI (e.g., CD-ROM) devices on both IDE interfaces. The system BIOS automatically detects the IDE device transfer rate and the translation mode capability.   Universal Serial Bus (USB) Support The system board has two USB ports. This permits direct connection of two USB peripherals without an external hub. If more devices are required, an external hub can be connected to either port. The system board supports the standard Universal Host Controller Interface (UHCI). Features of the USB include: Hot Pluggable Self-identifying peripherals Automatic mapping of function to driver and configuration Support for isochronous and asynchronous transfer types over the same set of wires Support for up to 127 physical devices Guaranteed bandwidth and low latencies appropriate for telephony, audio, and other applications Error handling and fault recovery mechanisms built into the protocol.   SCSI Subsystem The onboard SCSI subsystem features the Adaptec AIC-7985, which contains a double-speed SCSI controller and a PCI bus master interface in a 160-pin PQFP. Dual channel Each 16-bit wide UltraSCSI channel supports up to 15 SCSI devices 256-byte data FIFO Each SCSI bus supports two DMA channels; one for data transfers and one for prefetching commands Each UltraSCSI bus controller has 128 bytes of SRAM for holding prefetch instructions and 64 bytes of SRAM for data Stripping support across both channels 40MB/sec data transfer rate for each channel Supports four DMA channels for arbitration of PCI bus Supports two 20-MIPS (Million Instructions Per Second) sequences to control SCSI phase operations Capable of executing 256 SCSI commands simultaneously Uses both PCI INTA# and INTB# for PCI interrupts Two ultra-wide connectors One narrow 8-bit wide connector for slow devices.   SCSI Bus The SCSI data bus is 8- or 16-bits wide with odd ECC generated per byte. SCSI control signals are the same for either bus width. The system board has an onboard SCSI connector that supports 8- or 16-bit devices. On a 16-bit wide SCSI bus, the AIC-7985 assigns the highest arbitration priority to the low byte of the 16-bit word. This way, 16-bit targets can be mixed with 8-bit targets if the 8-bit devices are placed on the low data byte. During chip power-down, all inputs are disabled to reduce power consumption.   Front panel connectors The front panel I/O connector block lets you connect devices such as speakers, infrared transducers, and power management accessories. Although this guide does not discuss these connections, this illustration is provided for your future use.   Jumper settings This system board uses a BIOS routine to affect changes to the system: Set processor speed Clear passwords Flash boot recovery.   Set processor speed You can set the processor speed with the BIOS by moving jumper J7E1 prior to boot, from the normal 1-2 pin position to the 2-3 pin position. The 2-3 pin setting initiates a BIOS maintenance mode that allows you to set the processor speed. Once the processor speed has been set and the configuration has been saved, replace the J7E1 jumper to the 1-2 pin position. Restart the system and the Power Up screen should display the new processor speed.   Clear passwords Forgotten passwords can be cleared using the same process. Enter the BIOS routine by moving jumper J7E1 from the normal 1-2 pin position to the 2-3 pin position. The 2-3 pin setting initiates a BIOS maintenance mode that allows you to clear system passwords. Once the passwords have been cleared and the configuration has been saved, replace the J7E1 jumper to the 1-2 pin position. Restart the system and all passwords should be removed.   Flash boot recovery Note: This procedure should only be used if the BIOS has been corrupted. The BIOS may be recovered if corrupted by totally removing the J7E1 jumper from the normal 1-2 pin position and restarting the system using the recovery diskette in the diskette drive.   Installing memory Your computer’s system board supports SDRAM (Synchronous Dynamic Random Access Memory) and DIMMs (Dual In-line Memory Modules). Four DIMM sockets are available on the system board, named Bank 0, Bank 1, Bank 2 and Bank 3. You can fill Bank 0, Bank 1, Bank 2, Bank 3 or any combination of banks with DIMMs. No jumper settings are required for the memory size or type because this information is automatically detected by the BIOS. You can use 8, 16, 32, 64 and 128MB DIMMs in any combination, bank or order to expand the SDRAM up to 512MB. Note: Any additional SDRAM DIMMs added to the system should conform to the Intel 4clock 66MHz unbuffered SDRAM DIMM specification. DIMMs that do not conform to this specification, may not function in your system.   To install DIMMs: Pull open the plastic DIMM socket clamps on each side of the socket. Insert the DIMM into the socket, as shown below. Insert it perpendicular to the socket and align the two notches in the DIMM with two notches in the DIMM socket. Gently press the DIMM into the socket until it doesn’t move any farther. (Inserting the DIMM automatically locks each of the socket clamps on each end of the DIMM.   To remove DIMMs: Gently push out first one and then the other plastic socket clamp on each end of the DIMM. The DIMM should pop up slightly from the socket. Carefully lift the DIMM out of the socket. Caution! Never try to remove a DIMM without releasing the clamps. You may break the socket, causing serious damage.   Installing a second processor You can easily install/upgrade the secondary (application) processor on this system board. See "System board connections" for the specific location of the secondary processor.   To install a processor: Follow the static electricity preventions and precautions. Remove the two screws that hold the processor retaining cap to the processor retaining brackets and set them aside. Position the processor with the heat sink facing the rear of the system board.   Plug the processor straight into the secondary processor connector. Make sure that you push evenly on both edges until the processor is firmly seated. You can slightly seesaw processor end-to-end as you work it into the slot, but do not bend the processor sideways. Replace and secure the processor retaining cap using the two screws removed in Step 2.   Notices   All rights reserved This publication is protected by copyright and all rights are reserved. No part of it may be reproduced or transmitted by any means or in any form, without prior consent in writing from Gateway 2000. The information in this manual has been carefully checked and is believed to be accurate. However, Gateway 2000 assumes no responsibility for any inaccuracies that may be contained in this manual. In no event will Gateway 2000 be liable for direct, indirect, special, exemplary, incidental, or consequential damages resulting from any defect or omission in this manual, even if advised of the possibility of such damages. In the interest of continued product development, Gateway 2000 reserves the right to make improvements in this manual and the products it describes at any time, without notice or obligation.   Trademark acknowledgments AnyKey, cow spot motif, CrystalScan, Destination, Field Mouse, Gateway 2000, GW2K, HandBook, TelePath, Vivitron, stylized "G" design, and motto "You’ve got a friend in the business" are registered trademarks and EZ Pad, Family PC, and Gateway Solo are trademarks of Gateway 2000, Inc. Intel, Intel Inside logo, and Pentium are registered trademarks and MMX is a trademark of Intel Corporation. Microsoft, MS, MS-DOS, and Windows are trademarks or registered trademarks of Microsoft Corporation. All other product names mentioned herein are used for identification purposes only, and may be the trademarks or registered trademarks of their respective companies. Copyright © 1997 Gateway 2000, Inc. 610 Gateway Drive, N. Sioux City, SD 57049 USA   Regulatory Compliance Statements American Users: This device has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio or television reception. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause interference to radio and television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio/TV technician for help. Caution! The Federal Communications Commission warns the users that changes or modifications to the unit not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment. Accessories: This equipment has been tested and found to comply with the limits of a Class B digital device. The accessories associated with this equipment are as follows: Shielded video cable Shielded power cord. These accessories are required to be used in order to ensure compliance with FCC rules. Canadian Users: This digital apparatus does not exceed the Class B limits for radio noise emissions from digital apparatus as set out in the radio interference regulations of Industry Canada. Le présent appareil numérique n’émet pas de bruits radioélectriques dépassant les limites applicables aux appareils numériques de Classe B prescrites dans le règlement sur le brouillage radioélectrique édicté par Industrie Canada. European Users: This Information Technology Equipment has been tested and found to comply with following European directives: [i] EMC Directive 89/336/EEC amending directive 92/31/EEC & 93/68 EEC as per - EN 50081-1:1992 according to EN 55022:1995 Class B EN 61000-3-2:1995 or EN 60555-2:1986 EN 61000-3-3: 1995 - EN50082-1:1992 according to EN 61000-4-2:1995 or IEC 801-2:1984 ENV 50140:1994 or IEC 801-3:1984 EN 61000-4-4:1988 or IEC 801-4:1998 [ii] Low Voltage Directive (Safety) 73/23/EEC as per EN 60950: 1992 Japanese Users: This equipment is in the Class 2 category (Information Technology Equipment to be used in a residential area or an adjacent area thereto) and conforms to the standards set by the Voluntary Control Council for Interference by Information Technology Equipment aimed at preventing radio interference in such residential area. When used near a radio or TV receiver, it may become the cause of radio interference. Read instructions for correct handling. Australian and New Zealand Users: This device has been tested and found to comply with the limits for a Class B digital device, pursuant to the Australian/New Zealand standard AS/NZS 3548 set out by the Spectrum Management Agency. Caution! Disconnect power before servicing. Attention! Couper le courant avant l’entretien.