Pentium^® 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. CPU Intel Pentium® MMX™ processor or Intel Pentium® processor CPU speed Intel, 90, 100, 120, 133, 150, 166, or 200 MHz Processor upgrade Accepts Intel Pentium OverDrive upgrade Cache subsystem L1: Primary, 16K write back cache; 8K code/8K data on Pentium CPU L1: Primary, 32K write back cache; 16K code/16K data on Pentium MMX CPU L2: Secondary 512K pipelined burst cache, on system board RAM Synchronous Dynamic RAM (SDRAM) or Extended Data Out (EDO) Dual Inline Memory Modules (DIMMs); two banks with one 168-pin DIMM socket per bank; one socket is one bank. Expandable to 256 MB SDRAM or EDO RAM. Uses only CL2 4 clock SDRAM DIMMs. BIOS AMI BIOS: Flash BIOS for easy updates from floppy disks IDE interfaces Supports up to four ATAPI IDE devices (hard drives or CD-ROMs) using two on-board PCI IDE adapters; automatic drive type selection for easy setup. Floppy drive A floppy controller is integrated on the system board. Support available for primary and secondary floppy drives and a tape backup unit (TBU). I/O ports One parallel and one serial port on system board; two USB ports; LPT and COM configurable from system setup program; no jumper settings required; header on the system board for additional serial port. Mouse Microsoft PS/2 mouse connector Keyboard Microsoft PS/2 keyboard connector ISA expansion slots Two or Three (One slot is shared with PCI) PCI bus expansion slots Three or Four (One is shared with ISA) 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: >0.2 inch after installation, top and sides Certification FCC Class B, UL, CUL, EN55022, EN50082-1, EN60950 Many Gateway 2000 products are custom engineered by our suppliers to Gateway 2000 specifications, and may vary with similarly marketed products.   The Setup Utility BIOS has a built-in Setup utility that allows you to set several basic system characteristics. The settings are stored in battery-backed CMOS Memory that retains information about your system when the power is off. To enter the Setup Utility, press <F1> when the prompt to do so appears on the screen shortly after your computer is turned on (during what is called the Power On Self Test (POST) process). After a moment, the Main Setup menu appears: Notice a separate box on the right side of the screen. This is the Command Screen, and it is displayed as part of every window in the Setup utility. It contains commands in white text that help you move through the Setup functions that are presented in black text. An illustration of this command screen follows. Help Command — Press <F1> to retrieve information about highlighted items. Back Command — Press <Esc> to back out of any menu field. Select Command — Press <Enter> to select submenus and options. Previous Item Command — Press the Up Arrow to move up the list of menu items. Next Item Command — Press the Down Arrow to move down the list of menu items. Select Menu Command — Use the Left and Right Arrows to move among the four major menus. Setup Defaults Command — Press <F5> to set the Setup Utility to its factory default values. Previous Values Command — Press <F6> to set all Setup Utility values as they were when you entered the Setup Utility. Save & Exit Command — Press <F10> to exit the Setup Utility.   Using the Main Setup menu Several items of information in this menu tell you about your system. You can change some of the items. Others are provided solely for your information.   System time and date These fields provide you with the current date and time. Note that the hour is displayed as a 24-hour clock. For example, 1:00 PM is 13:00:00.   Floppy options Highlight this item and press <Enter> to view the floppy drive options submenu screen. This submenu provides you with information about the floppy disk drives that may be installed in your system. Press <Enter> on the highlighted floppy drive type to see its options submenu. You should only change the floppy drive type if you have installed another floppy drive shown on the list, wish to disable floppy disk support, or if CMOS values are lost.   Primary/Secondary IDE device setup Your system board can support two IDE devices (hard drives, CD-ROM drives) on the system board primary IDE connector, and two more on its secondary IDE connector. Highlight the first hard drive item, called Primary IDE Master, and press <Enter>. The Primary IDE Master information submenu appears (See the Primary IDE Master submenu). The IDE device configuration default setting is Auto Configured, which allows the computer to detect and set up any IDE device. If the IDE device is changed while the power to system is off, the computer detects the new IDE devices and sets the devices’ proper settings. You can change the hard drive type to User Definable by pressing <Enter> on the highlighted bar. You may need to choose the User Definable mode if you are running Novell and have a 528MB or larger size drive. Highlight User Definable and press < Enter>. Now you can fill in the fields with your specific information found in your hard drive documentation For example, set the drive to 4960 cylinders, 16 heads, and 63 sectors. The size shows 1549MB. You can also change the device type to Disabled. Choose this setting if you are using SCSI devices or to disable BIOS support for an IDE device. IDE Translation Mode controls the way your system interacts with the hard drive in terms of the drive size, capabilities, and the operating system that it uses. The default setting is Auto Configured. This allows the BIOS to detect automatically proper IDE translation mode. Select Standard CHS if the computer is using a 528MB or smaller hard drive that does not support Auto detection, or the operating system does not support Logical Block Addressing (LBA) or Extended CHS. Select Extended CHS if the system is using a hard drive larger than 528MB. Check your hard drive manual to determine which of these modes your hard drive supports. Some operating systems do not support LBA and/or Extended CHS translation modes. In these cases, this parameter should be set to Standard CHS. Check the documentation for your specific operating system to see if it supports these extended modes. MS-DOS, Windows 3.X, and Windows 95 all support LBA and Extended CHS modes. Multiple Sector Setting controls the number of sectors transferred by an IDE drive per interrupt generated. The default setting is Auto Configured. Press <Enter> on the Multiple Sector Setting field to see the other options: Disabled, 4 sectors/Block, or 8 sectors/Block. Check the specifications for your hard disk drive (found in its documentation) to determine which setting provides the optimum performance for your drive. Fast Programmed I/O Modes controls the speed at which programmed I/O transfers occur on the PCI- IDE interface. The default setting is Auto Configured, which causes transfers to occur at the maximum speed supported by the drive. Highlight the second hard drive item, called Primary IDE Slave, and press <Enter>. All of the fields shown on this submenu function the same as those listed on the Primary IDE Master screen.   Language This field controls the language of the text strings used in the Setup Utility and in reporting system errors. Any installed language appears as an option in its own language. See the following for details.   Boot Options Highlight First Boot Device and press <Enter> to see the submenu, in which you can select several parameters that affect the computer’s boot up configuration. Boot Device fields (First through Fourth) allow you to choose the order in which your computer attempts to select a boot device. You choose the device you want for each field by pressing <Enter> to view the choices. No two Boot device fields can be set to the same option. The default Boot Device order is as follows: Floppy, 1st IDE HD, and Disabled. Make sure any unused Boot Device fields are set to Disabled. The Display Gateway 2000 Logo field controls whether the Gateway 2000 Logo is displayed during boot up.Yes displays the logo at boot. No turns it off. Note: If you place an older video adapter in your PC, the logo may be displayed incorrectly. Turn off the Logo display to avoid any conflicts. The Logo Effects field is displayed only if the Logo is displayed. The logo scrolls across the screen if the option is set to Enabled. The Pause On Config. Screen field allows you to delay the configuration screen displayed on boot up. The System Cache field controls the primary and secondary caches. We recommend leaving it set to Enabled, since setting it to Disabled degrades system performance. The Num Lock field controls whether the keyboard Num Lock function is turned on or off when the system boots up. Since the AnyKey keyboard has separate numeric and cursor keys, we recommend you set this to On. However, the factory default setting is Off. The Setup Prompt field controls whether the "Press <F1> to Enter Setup" message is displayed during POST. Enabled is the default setting; the Disabled setting shuts off the "Press <F1> to Enter Setup" message during POST. The Hard Disk Pre-Delay field delays the computer’s attempt to initialize the first IDE drive in that system. This is necessary because some drives may hang if they are accessed too soon following power up or reset. This delay only affects the first drive to be accessed. Disabled is the default setting. The other options are 3, 6, 9, 12, 15, 21, or 30 seconds. The Typematic Rate Programming field controls whether or not your system uses default or user configurable values for two subitems: Typematic Rate Delay and Typematic Rate. Since the 104+ keyboard has typematic functions built in, you can set this to Default. If you choose Override, the following two sub items appear: Typematic Rate Delay. This item sets how long a key must be held down before it begins to repeat. It is functional only if Typematic Rate Programming is set to Override. Typematic Rate. This item sets how fast a key repeats. It is functional only if Typematic Rate Programming is set to Override. The Video Mode field is for information only. It tells you the computer’s video mode. The Mouse field is for information only. It describes whether or not you have a PS2 mouse Installed or Not Installed. The Base Memory field is for information only. It reports the amount of conventional memory in your system, normally 640 KB. The Extended Memory field is an information field only. It should report your total RAM above the first 1MB.   Using the Advanced Setup menu Use the Right Arrow to toggle to the next menu, the Advanced Setup menu. The Processor Type is an information-only field that describes the processor type installed, normally Pentium Family. The Processor Speed field is for information only. The Processor Speed item displays either 90, 100, 120, 133, 150, 166, 200 or 233 MHz, depending on the jumper block configuration setting for the CPU speed. The Cache Size field is for information only. Cache size item displays the size of the installed cache. Cache size is automatically detected. The size is 512K. If, however, the CMOS is cleared, the Setup program reports 0K until the computer is rebooted. The Bank 0 DIMM Detected and Bank 1 DIMM Detected fields automatically detect and display installed memory DIMM types, EDO or SDRAM.   Peripheral Configuration By pressing <Enter> on this highlighted option, you can select the Peripheral Configuration submenu. This submenu allows you to enable or disable several peripherals and on-board resources. The Primary PCI IDE Interface field allows you to enable or disable the primary IDE hard drive/CDROM interface. You can choose Enabled or Disabled. The default setting is Enabled. The Secondary PCI IDE Interface field allows you to enable or disable the secondary IDE hard drive/CDROM interface. You can choose Enabled or Disabled. The default setting is Enabled. The PCI IDE Bus Master field allows you to enable or disable Bus Mastering. The Floppy Interface field allows you to enable or disable the floppy diskette drive interface. You can choose Enabled or Disabled. The default setting is Enabled. The USB Legacy Keyboard field allows you to activate or deactivate the USB keyboard support for operating systems other than Windows 95. Enabled activates the support for all other operating systems. Disabled deactivates the USB support. Disabled is the default setting for computers with Windows 95. Note: The options for Serial Port 1 Address and Serial Port 2 Address are the same. See the options depicted on the Serial Port 2 Address graphic for Serial Port 1 Address. The Serial Port 1 Address field allows you to select the address of serial port 1. The default setting is Auto. The Serial Port 2 Address field allows you to select the address of serial port 2. Several options are available. The default setting is Auto. The Serial Port 2 mode field allows you to select Normal mode or Fast IR mode. Normal is the default mode. The Parallel Port Address field allows you to select the address and IRQ of the parallel port. The default setting is Auto. The Parallel Port Mode field allows you to select the mode for the parallel port. The setting you choose depends on the type of peripheral installed with your system. The following illustration displays several options. The default setting is Normal, a Bi-directional, input-output only mode (the parallel port operates in bi-directional PS/2-compatible mode). ECP is an Extended Capabilities Port mode. EPP is an Enhanced Parallel Port mode. Selecting either ECP or EPP means that the parallel port operates in both high speed and bi-directional modes. The Serial Port 1 Status field displays the current status of the serial port 1 address and IRQ indicated in that field. Any changes that you make to the corresponding user configuration fields do not take effect until you save and exit the Setup Utility. The Serial Port 2 Status field displays the current status of the serial port 2 address and IRQ indicated in that field. Any changes that you make to the corresponding user configuration fields do not take effect until you save and exit the Setup Utility. The Parallel Port Status field displays the current status of the parallel port mode indicated in that field. Any changes that you make to the corresponding user configuration fields do not take effect until you save and exit the Setup Utility.   Advanced Chipset Configuration By pressing <Enter> on this highlighted option, you can select the Advanced Chipset Configuration submenu displayed in the next graphic: This submenu allows you to change the characteristics of your computer’s PCI Latency Timer and Video Palette Snoop. The Video Palette Snoop, when set to Enabled, allows an ISA video card to share a common palette with a PCI graphics card. If your system is configured with only a PCI graphics card, you should leave this item set to its default setting of Disabled. The Latency Timer (PCI Clocks) field controls the length of time an agent on the PCI bus can hold the bus when another agent has requested the bus. The default is 64 and should not be changed.   Power Management Configuration By pressing <Enter> on this highlighted option, you can select the Power Management Configuration submenu. The Power Management Support field allows you to enable or disable BIOS support for Advanced Power Management (APM) support. If you choose Enable, the system works with APM-aware operating systems and software to manage the power consumed by the CPU, IDE drives, and graphics cards. Enabling the APM support activates the Fast Start power and power button features. When APM support is active in both the BIOS and the operating system, the Power button function changes. See the "Fast Start Mode Power Management" section for a discussion of the Fast Start features. If you choose Disabled, then none of the other fields in the Power Management Configuration submenu are displayed. The IDE Drive Power Down field controls whether a spin-down command is issued to the IDE drives when the system goes into low power mode. Choose Enabled or Disabled. The Vesa Video Power Down field controls the VESA power management command issued to the graphics card when the system goes into low power mode. Several settings are provided in the submenu. The proper setting is dependent upon the VESA mode(s) supported by your graphics card. The Inactivity Timer controls the number of minutes that the system detects no user activity before switching to low power mode. The default setting is 20 minutes. When the computer comes out of the power save mode, it emits three beeps to notify you that it is out of the power save mode. Video may take a few seconds to reappear on your monitor. If you have set a User Password, you must enter that password before the computer comes out of the power-managed state. Instructions for setting a User Password are in the "Using the Security Setup Menu" section. The Fan Always On field overrides APM fan control. The APM fan control turns the fan off any time the computer enters a power-managed state. Set to the Yes option, the fan remains on any time the computer is powered on or in an APM state. If SCSI devices are detected in the computer, the fan remains on. Fast Start Mode Power Management The Fast Start Mode is an enhanced feature of this system board. It enables the user to put the computer into a "power save" (sleep) mode by pushing the power button. The computer appears to be completely off. To return it to its state prior to entering the "power save" mode, push the power button again. The table below summarizes the operation of the power button. These instructions are also noted on the sticker on the front of your case. A detailed description of these instructions is shown after this figure.   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 power button for 5 seconds OFF   To reset the computer with PM enabled: Push in the power button and hold for five seconds. Push in the power button again to turn on the computer. If Power Management Support is Active, the power button operates differently from when Power Management Support is disabled. If Power Management Support is Active: From the OFF state, pressing the power button turns on the system. The system goes through the POST routine and boots into the operating system. The power LED turns green. From the ON state, pressing the power button sends the system into "POWER SAVE" (sleep) state. During this state the system appears OFF to the user, draws very little power, and the power LED turns amber. From the "POWER SAVE" (sleep) state, pressing the power button returns the PC to the same ON state that existed before going into the "POWER SAVE" (sleep) state. This occurs without the computer going through the boot routine. This is Fast Start Mode and the power LED turns green. This enables the user to return to the application or file in use before the "POWER SAVE" (sleep) state was activated. From the ON state pushing the power button and holding it for more than five seconds shuts down the PC completely and the power LED goes off. Note: With the Fast Start Mode, you do not need to turn off the PC completely). To RESET the computer when it is locked up, try pressing the <Ctrl>, <Alt>, and <Del> keys simultaneously. If this does not work, push and hold in the power button for five seconds to turn off the PC. Push the power button again to power up the computer. To shut down the PC immediately when it is going through the POST routine, push and hold in the power button for five seconds. Note that if the power button is given a short (less than five seconds) push, the PC remembers that the button has been pushed, and it shuts down the computer just before the computer enters Windows 95. To shut down the system when you are in the SETUP utility, push and hold in the power button for five seconds to shut down the system. If Power Management Support is Not Active: From the OFF state, press the power button to power on the system. From the ON state, press the power button to shut down the system.   Plug and Play Configuration Press <Enter> on this highlighted option to select the Plug and Play Configuration submenu. Note: The Plug and Play Configuration screen is dynamic. The available IRQs change according to the peripherals installed and the IRQs that the peripherals use. This submenu allows you to match system configuration to level of Plug and Play support provided by the operating system. The Configuration Mode field allows you to choose the method in which information about legacy ISA cards (ISA cards that are not Plug and Play aware) is conveyed to the operating system, and allows the system software to set up PCI and ISA Plug and Play cards without conflicting with the legacy ISA cards. Press <Enter> with the Configuration Mode field highlighted to access the submenu options. If you choose Use Setup Utility, the BIOS depends upon information provided by you to prevent conflicts between Plug and Play cards and legacy ISA cards. If you choose this option, you should not install and use run-time Plug and Play software utilities (Configuration Manager and ICU). If you choose Use ICU then the BIOS uses the information provided by the run-time Plug and Play software utility (Configuration Manager and ICU) to ensure no conflicts with legacy ISA cards. Choose this option only if you are using MS-DOS or Windows 3.x. If you choose Use PnP OS, you must use a Plug and Play aware operating system (Windows 95). The ISA Shared Memory Size field is used to specify a range of memory addresses that are directed to ISA legacy cards. This field should be set to a memory size (16KB, 32KB, etc.) only when a non-Plug and Play ISA card (legacy card) is used that has its own non-ROM memory space. Local Area Network (LAN) cards that have on-board memory buffers are one example of this. Video capture cards that have video buffer memory are another. The default (Disabled) is for all upper memory may be accessed by Plug and Play devices. Note: If you choose an option other than Disabled, a second field appears. This field displays a corresponding base address for the memory size you selected. You have the option to change the base address for all memory options except 96KB, because this option takes up the entire memory block. The IRQ and DMA fields are used to indicate whether individual interrupts and DMA channels are used by ISA legacy cards. If not used, then they should be set to PCI/PnP/ISA. If they are used, they should be set to ISA Only. It is important to remember that all but one IRQ can be set to Used by ISA Card. At least one IRQ must remain available for the PCI bus and for PCI cards that use interrupts to function. The Reserve I/O space field allows for 2 through 64 bytes of I/O space to be reserved for ISA legacy resources. The Shared PCI IRQs field forces 1 or 2 IRQs for allocation to PCI devices. If Auto is selected for this field, the BIOS does not restrict the number of IRQs used by PCI devices.   Using the Security Setup menu In this menu, you can set two types of passwords for your Security Setup program. The two types of passwords are User Passwords and Administrative Passwords. The Set User Password allows you to set a password to control access to the Setup Utility, the keyboard initial boot, and the keyboard when used along with the Security Hot Key. The Administrative Password allows an administrator (one with knowledge of the Administrative Password) to limit or to deny access to non- administrators. The following Setup fields are accessible to administrators only. They are not displayed if an Administrative password has not been set. Access Modes: Allows the administrator to set the level of Setup Utility access allowed to non-administrators. Unlimited Access: A non-administrator can access all Setup Utility fields except administrator-only fields. Limited Access: A non-Administrator can access Time, Date, and User Password fields only. A non-administrator can view other fields, but they cannot change them. View Only: A non-administrator can view all Setup Utility fields, but cannot change any fields. No Access: Access to the Setup Utility without an Administrative Password is not allowed. Delete User Password: Allows an administrator to delete a User Password. This field is displayed only if both an Administrative Password and a User Password have been set. The following table describes the interaction between these passwords:   Password in Effect Enter Setup with User Password Enter Setup with Admin Password Boot User Password only Can change all fields N/A User Password required Admin Password only N/A Can change all fields No Password required Both Can change limited number of fields Can change all fields User or Admin password required When you press <Enter> on the highlighted Set User Password field, the Set User Password submenu appears: Enter your password in the Enter New Password block. Then, retype it in the Confirm New Password block. Your password is now set. The previous window above is for Set User Password, but it appears the same for Set Administrative Password. You can tell if a password has been set in either of the two fields by looking at the top of the Security menu screen. If either the User Password or Administrative Password fields report Installed, then a password is set for that field. If you are entering a new password in either field to replace an older one, the pop-up window will look about the same, except the words Enter Current Password appear at the top. If you have set a password in the User Password field, an additional field, Unattended Start, appears. This field controls the point at which you must enter the User password. If you choose Enable, you must give the User password after the system has completed automatic boot activity and before you can use the keyboard (the keyboard is locked and the NUM LOCK, CAPS LOCK, and SCROLL LOCK lights are flashing). If you choose Disable, you must give the password before the system starts automatic bootup. Another field you see if you have entered a User password is the Security Hot Key (CTRL-ALT-) field. Use this field to define a key that, typed simultaneously with <Ctrl> and <Alt>, places the system into secure mode by locking out the keyboard. When you type in the Security Hot Key, the Num Lock, Caps Lock, and Scroll Lock lights on your keyboard flash on and off in sequence, indicating that your system is now secure.   Setup Exit menu This menu allows you to choose whether to keep any changes in the Setup Utility that you may have made before exiting. If you press <Enter> on the Exit Saving Changes field, the Exit Saving Changes screen appears: The Exit Saving Changes field allows you to exit the Setup Utility and save the current entries for all parameters. If you press <Enter>, the system exits Setup with all the parameters set to their current values. If you press <Esc>, you return to the Exit menu without saving any changes. The Exit Discarding Changes field allows you to exit the Setup Utility and discard any changes you may have made to the Setup parameters.If you press <Enter>, the system exits Setup and throws out any changes you made to the parameters. If you press <Esc>, you return to the Exit menu with no change. The Load Setup Defaults field allows you to load factory default values into all Setup parameters, except for passwords. If you choose <Enter>, the factory defaults are loaded into all Setup parameters, except for passwords. If you choose <Esc>, you return to the Exit menu with no change. The Load Setup Defaults option is available only if you are an administrator (if you have set up an administrative password) or if you have User unlimited access you can load the factory default Setup Utility settings.   The System Board This chapter discusses the features and connection points for your system board. It also details different configuration options for memory and processor speed. 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.   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.   To remove the cover: Take precautions against static discharge. Work in a static-free area and use a grounding strap whenever you handle electronic components. Power down the computer and disconnect the power cord and all other cables from the back of the unit. Remove only the screws that hold the cover in place. Refer to the documentation that shipped with your computer 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. The system board has seven expansion slot connectors. Three connectors are ISA-bus 8/16-bit slots. Four connectors accept expansion cards with a 32-bit PCI local bus interface. The ISA and PCI slots that are next to each other on the system board are shared. You can place an expansion card in only one of the shared slots. This system board accepts two types of expansion cards ISA and PCI cards. Some ISA expansion cards have jumpers or switches that set interrupts and I/O addresses, and they have instructions that explain how to set them to avoid conflicts. Follow the instructions carefully. If you install a PCI card, simply plug it in. Refer to the system board illustration for the proper installation location. Windows 95 configures the card for you.   To install an expansion card: Set any jumpers and switches on the card if required in the card’s instructions. Power down the system and remove the cover. If you have a tower case, lay the unit on its side 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 re-install if you ever remove the card. Seat the expansion card firmly in the slot. Secure the card to the rear panel with the screw from step 5. Attach any cables according to the card’s instructions. Replace the system unit cover. Install any software that the card may require. Some important system board features, shown on the previous page, are described briefly below.   System board connectors Power connector Fan connector Floppy connector Primary IDE connector Secondary IDE connector Front panel I/O connectors 3V battery J28, J29 ISA expansion slots PCI expansion slots DIMM slots Parallel port (top); COM1 serial port (bottom left) USB connectors Stacked PS/2 mouse and keyboard connectors JB1, J21 CPU   Back-panel connection points USB connectors 25-pin parallel port LPT1 9-pin serial port COM1 PS/2 mouse (top) and PS/2 keyboard connectors (bottom)   Cable Routing To reduce emissions to a minimum, we recommend routing the floppy cable and the IDE device cables in a certain manner. The following illustrates the correct routing for these cables. IDE cables Floppy cable Whenever you open your computer’s case and work with components on the system board, route the cables as noted in the preceding graphic.   System Board connection descriptions   Expansion slots Up to six expansion slots may be populated on the system board. There are three ISA bus expansion connectors and four PCI expansion connectors. All four PCI expansion slots accept only PCI bus master cards, and fully support the PCI 2.1 specification.   Battery This external 3 volt, lithium coin-cell style battery supplies power to the integrated real time clock (RTC) and CMOS memory. The battery has an estimated lifetime of three years and is socketed for easy replacement. When the system is on, power is supplied from the power supply to extend the life of the battery.   DIMM sockets One DIMM socket comprises a bank. You can fill one or both banks with DIMM components, in combinations listed according to the charts in the "Installing Memory" section of this manual.   Power connector This single-unit connector supplies power to the system board components and cooling fan. It is keyed to fit only one way.   Fan connector This connector allows the system software to control the fan, turning it on or off (overriding the power connector).   J28 flash update jumper This allows the BIOS to be updated if the BIOS has become corrupted or has been improved. A plastic jumper shunt covering Pin 2 is for normal operations; a plastic jumper shunt connecting Pins 1 and 2 is for BIOS recovery.   J29 password, Setup Utility, NVRAM clear settings jumper This allows the password, system setup, and NVRAM to be cleared. A plastic jumper shunt covering Pin 2 is for normal operations; a plastic jumper shunt connecting Pins 1 and 2 is for clearing the password setup and NVRAM. To clear NVRAM without clearing the system setup utility and the password, turn on the computer holding the <N> and the <Ctrl> keys simultaneously. This method does not work with USB keyboards or keyboards connected to the computer through a switchbox.   Stacked connectors The keyboard and mouse; and parallel port, USB, and COM1 connectors are stacked on this system board.   Front panel I/O connectors Speaker Reset switch Power and sleep LED Hard drive activity light Infrared port Power on/off Speaker (1) — Supports either on-board Piezo speaker or an external speaker. Power on/off (6) — Connects to power button on the front bezel to turn the PC on or off. For PCs with APM support enabled, acts as on/off suspend button.   Jumper settings The jumper configuration blocks on the system board allow you to alter several system functions. Use the illustrations on the following pages to set the jumpers according to the functions you need to use. The jumpers were set to their default positions at the factory, so you only need to alter the jumpers if you are changing a function.   Jumper settings for system speeds The following illustrations show the correct jumper settings on the JB1and J21 jumpers for the 200 MHz processor speed. Processor speed jumpers; JB1 (left), J21 (right) In addition to the 200MHz processor speed processor speed, the system board also supports a variety of other processor speeds. The chart in the next section describes these additional settings.   Jumper settings chart for system speeds Below is a complete list of jumper settings and the resulting processor speeds, memory clock speeds, and CPU clock multiplier. You can use this chart to further customize your system to best fit your computing needs. Be sure that the processor on the system board matches these settings the JB1 and J21 jumper sets if you switch or upgrade processors.   CPU Speed CPU Clock Memory Clock JB1 J21 90 MHz 1.5x 60 MHz 1-3, 2-4 2-3 100 Mhz 1.5x 66 MHz 1-3, 2-4 1-2 120 MHz 2.0x 60MHz 3-5, 2-4 2-3 133 MHz 2.0x 66 MHz 3-5, 2-4 1-2 150 MHz 2.5x 60 MHz 3-5, 4-6 2-3 166 MHz 2.5x 66 MHz 3-5, 4-6 1-2 200 MHz 3.0x 66 MHz 1-3, 4-6 1-2 233 MHz 3.5x 66 MHz 1-3, 2-4 1-2   Password/Setup Utility/NVRAM clear settings The following illustration shows the jumper pin settings for the system password clear, Setup Utility, and NVRAM functions and the normal operation function. To clear the settings, turn off the computer and move the jumper shunt on the J29 jumper block from its default position (pin 2, shown in the illustration) to pins 1-2. Turn on the computer and the password, Setup Utility, and NVRAM are cleared. Then, turn off the system again and replace the jumper shunt to its normal operating position. This procedure should only be performed if you have forgotten your user password or wish to clear NVRAM and Setup Utility because you believe that they are corrupt or malfunctioning. Password/flash update jumpers; J28 (top), J29 (bottom)   Flash update The preceding illustration shows the jumper pin settings for the flash update function and the normal operation function. To update the flash BIOS, power down the system and move the jumper shunt on from pin 2 on jumper J28 block from its default position (pin 2, shown in the preceding illustration) to pins 1-2. Power up the system and the CMOS is reset to its default values. Then, power down the system again and replace the jumper shunt to its normal operating position. This procedure should be done whenever the system BIOS is updated.   Installing memory Your computer’s system board supports known as Synchronous Dynamic Random Access Memory (SDRAM) Dual In-line Memory Modules (DIMMs). DIMMs represent an advancement in memory capability because they provide a 64-bit data path that allows for greater data transfer across the system board. The previous type of memory, Single In-line Memory Modules (SIMMs), provides only a 32-bit data path. Two DIMM sockets reside on the system board, arranged as Bank 0 and Bank 1, with each bank consisting of one socket. Bank 0 only, Bank 1 only, or both banks may be populated with DIMMs. Bank 1 operates independently of Bank 0, so Bank 0 can left empty and Bank 1 filled with a DIMM or vice versa. No jumper settings are required for the memory size or type; this information is automatically detected by the system BIOS. This system board requires CL (clock latency) 2, 4 clock DIMMs. Most pre-1997 DIMMs are 2 clock DIMMs. Should you desire to add more DIMMs to your computer, make sure that you purchase CL2, 4 clock DIMMs. Refer to the charts at the end of this section to see all of the possible combinations for SDRAM DIMMs.   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. The module is inserted perpendicular to the socket. The two notches in the DIMM must match up with notches in the 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 module should pop up slightly from the socket. Carefully lift the DIMM out of the socket. Never force the DIMM out of the socket without releasing the clamps. Failure to release the clamps may break the socket, causing critical damage.   DIMM Chart DIMM Bank 0 DIMM Bank 1 Memory Total 1M x 64 (8MB) or empty 1M x 64 (8MB) or empty 8MB 1M x 64 (8MB) 1M x 64 (8MB) 16MB 1M x 64 (8MB) 2M x 64 (16MB) 24MB 1M x 64 (8MB) 4M x 64 (32MB) 40MB 1M x 64 (8MB) 8M x 64 (64MB) 72MB 1M x 64 (8MB) 16M x 64 (128MB) 136MB 2M x 64 (16MB) or empty 2M x 64 (16MB) or empty 16MB 2M x 64 (16MB) 1M x 64 (8MB) 24MB 2M x 64 (16MB) 2M x 64 (16MB) 32MB 2M x 64 (16MB) 4M x 64 (32MB) 48MB 2M x 64 (16MB) 8M x 64 (64MB) 80MB 2M x 64 (16MB) 16M x 64 (128MB) 144MB 4M x 64 (32MB) or empty 4M x 64 (32MB) or empty 32MB 4M x 64 (32MB) 1M x 64 (8MB) 40MB 4M x 64 (32MB) 2M x 64 (16MB) 48MB 4M x 64 (32MB) 4M x 64 (32MB) 64MB 4M x 64 (32MB) 8M x 64 (64MB) 96MB 4M x 64 (32MB) 16M x 64 (128MB) 160MB 8M x 64 (64MB) or empty 8M x 64 (64MB) or empty 64MB 8M x 64 (64MB) 1M x 64 (8MB) 72MB 8M x 64 (64MB) 2M x 64 (16MB) 80MB 8M x 64 (64MB) 4M x 64 (32MB) 96MB 8M x 64 (64MB) 8M x 64 (64MB) 128MB 8M x 64 (64MB) 16M x 64 (128MB) 192MB 16M x 64 (128MB) or empty 16M x 64 (128MB) or empty 128MB 16M x 64 (128MB) 1M x 64 (8MB) 136MB 16M x 64 (128MB) 2M x 64 (16MB) 144MB 16M x 64 (128MB) 4M x 64 (32MB) 160MB 16M x 64 (128MB) 8M x 64 (64MB) 192MB 16M x 64 (128MB) 16M x 64 (128MB) 256MB   Installing USB software drivers and reinstalling Ultra ATA drivers   USB software drivers If you buy a USB device, you must install the USB drivers in Windows 95 to gain USB functionality. Your computer shipped with a 3.5" disk labeled, Integrated Controller Ultra ATA files for Windows 95, that you must use to enable the USB software drivers. Please consult the Readme text on the disk for installation instructions.   Ultra ATA drivers These drivers are installed on your PC. If you ever need to reinstall Windows 95, you must reinstall the Ultra ATA drivers after your Windows 95 installation. Your computer shipped with a 3.5" disk labeled, Integrated Controller Ultra ATA files for Windows 95, that you must use to reinstall the Ultra ATA drivers. Please consult the Readme text on the disk for installation instructions. To reset your computer’s IDE hard drive(s) and IDE CD-ROM drive(s) to Ultra ATA mode, please consult the following instructions. Your computer is configured for maximum performance using the Ultra-ATA mode. However, if you reinstall Windows 95 software on your PC, if you have reformatted your hard drive and are reinstalling Windows 95, or if you have added a hard drive or a CD-ROM to your system, please follow this procedure to set your hard drive and CD-ROM to or back to Ultra-ATA mode.   To set a drive to Ultra ATA mode: Turn your system on booting to Windows 95. Right-click My Computer. Click Properties, then Device Manager, then the Plus Sign <+> next to Disk Drives or CD-ROM, depending on which devices that you want to set to Ultra-ATA mode. Note: Your PC’s IDE hard drive and IDE CD-ROM may use the Ultra-ATA mode. You should follow this procedure for each IDE hard drive and IDE CD-ROM drive in your computer. For the CD-ROM, double-click the CD-ROM icon with a specific CD-ROM name following it that appears below the generic CD-ROM icon. Then go to Step 5. For the hard drive, double-click the hard drive icon that appears below the Disk Drives icon labeled, Generic IDE Disk. Click the Settings tab, then click in the box next to the word DMA. The box should be filled with a check mark. If the word DMA does not appear under in Options box in the Settings Tab, your device does not support Ultra-ATA mode, or if you have reinstalled Windows 95 refer to your installation instructions on the Readme file on the Integrated Controller Ultra ATA files for Windows 95 disk. Click on the OK button. The System Settings Screen should appear requesting that you turn off your computer and configure your hardware. Click Yes, when your system turns off, turn it back on and your device should operate in Ultra-ATA mode.   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.