PCI 486 System Board Installation Guide
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PCI400C-C Quick Reference
CPU Selection Jumper Switch Settings
WARNING
Note that there are two jumpers labeled OS. If the CPU used on your system board is a 3.3V CPU, leave these two OS jumpers OPEN. If your CPU operates at SV, both of the OS jumpers must be shorted on pins 2 and 3. Incorrect jumper settings may result in damage to the CPU. In addition , JP5 and JP7 should be left open in this version of the system board.
Chapter 1 Introduction
Incorporating advanced design techniques and the most recent technology, this PCI 486 system board provides you with the means to build a high-performance 486 personal computer system. The board features a PCI standard local bus design to enable your system to exploit the enhanced I/O performance available from a CPU local bus. This board also provides “green PC” power-saving functions that reduce the amount of power consumed by your computer when you are not actually working. In addition, the board integrates a built-in PCI-based IDE and a multi-I/O interface that supports four IDE devices, two serial ports, one parallel port, one game port, and two 3.5 or 5.25-inch floppy disk drive.
1.1 System Specifications
The following is a brief summary of this PCI system board’s features:
- Supports full range of Intel, AMD, UMC, and Cyrix 486 CPUs, including SX/DX/DX2/DX4/OverDrive.
- System speed: 25 to 40 MHz CPU speed: 25 to 100 MHz
- Chip Set: SiS 85C496/497 deep green chip set
- Dimensions: 8.65 x 11 inches
- Local bus interface: PCI local bus specification 2.0
- Expansion Slots: Four 16-bit AT slots and three 32-bit PCI slots
- Main Memory: 1 to 128 MB on-board system memory using 256K, 512K, IM, 2M, 4M, 8M, or 16M x 36-bit 70ns DRAMs with automatic DRAM configuration.
- System BIOS: Supports full green functions as well as plug-and-play function
. Cache RAM: 128KB, 256KB, 512KB, or 1MB write-back or write-through cache - Supports deep green features
- Integrated multi-I/O
– Supports two serial (fast UART 16550 compliance), one parallel (supports EPP/ECP function), and one game port
– Supports two 3.5 or 5.25-inch FDDs - Integrated PCI IDE
– Complies with 32-bit PCI local bus specification 2.0
– Supports four IDE devices with enhanced IDE mode 3,4 and above
1.2 System Board Layout
The major components on your system board and their locations are depicted in the diagram on the next page.
Expansion Slots
This 486 system board has four 16-bit AT expansion slots and three 32-bit PCI local bus expansion slots. The 16-bit slots have two sections, one long and one short. The long sections may be used to install 8-bit add-on cards, if necessary. The 32-bit slots are used to install PCI local bus specification add-on cards
BIOS
A standard design feature of PC/AT-compatible system boards is a basic software program permanently stored in a memory chip on the board tween the CPU and the other components and peripherals in the system.
- AT expansion slots
- PCI expansion slots
- Keyboard connector
- Main memory banks
- Power supply connector
- Case feature connectors
- BIOS
- CPU socket
- SiS 85C496/497 chip set
- Data SRAMs
- Tag SRAM
- Lithium battery
- Voltage regulator
- IDE connectors
- Multi-I/O chip set
CPU Socket
The CPU socket on this system board is an OverDrive Socket 3, which is designed to support full range of 486 CPUs.
On-board Battery
An long-life lithium battery is installed on this system board. The battery is used to power the CMOS RAM in which information about the system configmation is stored while the system power is off. If the on-board battery fails, you may replace it with a lithium battery with the same module (CR2032). To attach the battery, be sure that the ” 4-” terminal of the battery must face up.
In addition, you can replace the on-board battery with a 4.5V to 6V battery via an external battery connector. To use an external battery, make sure that the on-board battery is disabled, (refer to section 2.1 and 2.2 for more information)
1.3 Static Electricity Precautions
Static electricity can build up in your body due to the type of clothing you are wearing, the carpet in the room in which you are working, or various items that you may touch. When working with delicate electronic components such as those found on your system board, you need to take precautions to prevent them from being damaged by electrostatic discharge.
Whenever installing or upgrading various parts of a computer system, you should take care to prevent a discharge of static electricity from your body or clothes to the components in the system. Fortunately, it is easy to prevent such discharges while you are working: each time you are going to pick up or begin installing a component, first touch a grounded object, such as the unpainted rear panel of your system unit or a water faucet or other grounded fixture in your work area. Any static electricity in your body will then be discharged through that object.
Chapter 2: System Board Setup
Before you begin installing your system board in the system unit case and connecting peripheral devices to the board, you must first prepare the board by setting the jumper switches, attaching the connectors, and installing the memory devices. This chapter will tell you how to perform these steps.
If your system board has already been installed by the dealer, you will still want to refer to this chapter in case you make any changes or upgrades to your system.
2.1 Jumper Switches
Jumper switches are used to select various operating modes.
Placing the plastic jumper cap over two pins connects those pins and makes a particular selection. Using the cap to cover two pins in this way is commonly referred to as shorting those pins. If the cap is not placed on any pins at all, this is referred to as leaving the pins open.
This section will explain the functions and settings of all of the user-configurable jumper switches on this PCI system board. To determine the locations of the jumpers, consult the diagram on page 2-2.
Jumper Switches
Cache Size Selection Junipers
Adjust the cache size selection jumpers to correspond to the size of the cache memory and the type of data SRAM installed according to the settings shown in Table 2.1:
CPU Selection Jumpers
The CPU selection jumpers are used to configure the system board for the type of CPU installed in the CPU socket. Adjust these jumpers according to the settings shown in Table 2.2. (Note: In Table 2.2 “NC” indicates “not connected”, or open.)
IMPORTANT NOTE: There are two jumpers labeled Q5 located to the left of the on-board battery. If the CPU used on your system board is a 33V CPU, leave these two Q5 jumpers open. If your CPU operates at 5V, pins 2 and 3 of both of the Q5 jumpers must be shorted. In addition, jumpers JP5 and JP7 must be left open in this version of the system board. Incorrect jumper settings may result in damage to the CPU.
Table 2.2: CPU Selection Jumper Switch Settings
System Speed Selection Jumpers
Jumpers JP3, JP4, and JP5 are used to configure the input clock to the CPU and PCI bus. Which of these speeds should be selected depends on the CPU and PCI cards installed in the system. Note that very few PCI add-on card can run at 40 MHz continuously and properly. Make sure that your PCI add-on card can operate at 40 MHz before you select 40 MHz for your system speed.
2.2 Connectors
Connectors are used to connect the system board to other parts of the system, including the power supply, the keyboard, and the various controls on the front panel of the system case. When attaching connecting wires to the con-nectors you should remember that some of them must be aligned in a specific way in order to function properly.
Connectors
Power Supply Most power supplies have two six-wire connectors that must be attached to the system board. Two of the wires on each connector are black. When attaching these two connectors to the power supply connector, align them so that the two black wires on each connector are in the middle, as shown below.
2.3 Main Memory
The on-board memory includes four slots labeled Banks 0 through 3. Each slot will hold one SIMM. The minimum amount of memory that may be installed on the board is 1 MB, and the maximum amount of main memory is 128 MB.
In addition to the minimum and maximum memory size of 1 MB and 128 MB, a variety of other configurations can be used. You can insert 256K, 512K, IM, 2M, 4M, 8M, or 16M x 36 bit 70ns DRAM modules in any slot to configure the main memory as you wish. The system will automatically adjust itself to run with the memory configuration you install.
Installing SIMMs To install SIMM modules, follow these instructions:
- Turn off the computer and all peripheral devices.
- Orient a SIMM with the first slot of the memory bank and insert the module into the slot at a 75-degree angle to the system board.
- After the edge connector on the module is inserted completely into the socket, gently push the module forward against the retaining clips on each end of the socket until it snaps into place.
2.4 External Cache Memory
The cache memory on the system board may be 128KB, 256KB, 512KB, or 1MB in size. In order for the cache memory to operate properly, you must have the correct memory devices installed and the correct jumper settings selected. Details concerning the configuration of the cache size jumper settings are given in section 2.1. Table 2.13 displays all possible cache memory sizes and recommended memory devices.
Installing the Cache Memory Devices
The procedure for installing individual SRAM chips in the cache memory banks is as foUows:
- First, orient the chip correctly with the socket into which it will be inserted. There is a U-shaped notch at one end of each SRAM chip. This notch should be aligned with the corresponding notch on the chip socket.
- Carefully align the pins of the chip with the holes of the socket and gently seat the chip part of the way into the socket. Check to see that the chip is level, that all of the pins are seated properly, and that there are no bent or misahgned pins.
- Once all of the pins are properly aligned, gently push the chip the rest of the way into the socket.
- Repeat this procedure until all of the SRAMs are installed.
IMPORTANT NOTE: When handling and installing memory devices, you should take care to follow standard precautions against static electricity (see section 13). To install or upgrade memory for your computer system, you are advised to consult an authorized dealer. Note that in some cases, altering the system board yourself may void the product warranty.
Chapter 3: System Installation
Once you have set up the system board and installed the main memory, you will be ready to install the board in a system unit case. This chapter provides general instructions on how to install the system board in a standard case along with the peripherals needed to complete a typical personal computer system.
3.1 Components
In addition to setting up the system board and installing the memory, you will need to install a number of peripheral components and connect the board to various devices on the system case in order to complete a computer system based on the system board. Some of these devices were referred to in chapter 2 above, where the system board connectors were described. A list of devices commonly used to build a computer system based upon this type of system board appears below. Aside from the last two items — the monitor and keyboard — all of these components are usually installed inside the system case.
- A system case similar to the Baby AT in size or one with compatible mounting holes.
- A standard 200W power supply (usually provided with the system case).
- A speaker (usually provided with the system case).
- A hard disk/floppy disk drive controller card.
- A monochrome, EGA, or VGA video card.
- One or two 5.25-inch and/or 3.5-inch floppy disk drives.
- A hard disk drive.
- Flat ribbon cables to connect the hard/floppy disk drive controller and the drives.
- A serial/parallel interface card to allow peripheral devices such as a printer to communicate with the system.
- A color or monochrome monitor.
- A keyboard.
3.2 Installing the Board in a Case
There are eight mounting holes on this system board, at least some of which should line up with the mounting holes on the case you have selected. The case should include screws or other mounting hardware for fastening the system board to the case. With some cases, the system board will need to be fastened down to the chassis inside the case with screws. Other cases may have a metal or plastic drawertype holder into which the system board is to be slid. In general, the manufacturer recommends using a case in which the system board is fastened down with a number of screws, as this design helps to ground the board thoroughly and divides the weight of the cards installed in the expansion slots more evenly across the board.
3.3 Controls and Connectors
Once the system board is secured to the case, you will need to attach various connectors on the board to the controls on the front panel of the system case. Most system cases will have several controls and indicators built onto the front panel of the case, as well as a speaker mounted inside the front panel. The various connectors provided on this system board for controls of this type are described in chapter 2 above. Follow the descriptions given there to connect the controls.
Once you have finished connecting these controls and indicators to the case, you may wish to tie the connecting wires together to make access to this area of the system board more convenient.
After you have completed attaching the controls and indicators to the system board, you will need to connect the board to the power supply via the power connector.
3.4 Case-Mounted Peripherals
The next step in installing your computer system will be to install the various peripheral devices that go inside the system unit case, such as floppy and hard disk drives, the disk drive controller card, serial/parallel interface cards, and other adapter cards. Consult the literature provided with those products or with your system case for further instructions on installing these devices.
Adapter Card Installation
You may wish to install additional add-on or adapter cards. Installation The procedure for installing add-on or adapter cards is essentially the same for all types of cards. Note, however, that on this system board either the rightmost AT expansion slot or the first PCI slot must be left empty. Only one of these slots may be used at a time.
- First check that the power for the system and all peripheral devices is turned off. Unplug all power cords from the back of the system unit.
- If you have already installed the system board in its case, loosen the screws on the rear panel of the system unit case that hold the cover in place and slide the cover forward so that you have access to the system board.
- Select an unused expansion slot and remove the slot cover corresponding to that slot from the rear panel of the system case. Save the screw holding the slot cover in place.
- Insert the adapter card firmly into the expansion slot and use the screw removed in step 3 to fasten it to the rear panel of the case.
- Replace the cover of the system unit case and fasten it in place with the screws removed in step 1.
For further instructions on installing adapter cards and other devices, consult the manuals provided with those products.
Installing an Adapter Card
3.5 Starting Up the System
Once the system board is mounted in its case and you have completed installation of the peripheral devices inside the case, slide the cover of the case into place and secure it to the rear panel of the case using the screws provided. Next, connect your keyboard to the keyboard connector on the rear panel and your monitor to the output from the video card, also on the rear panel.
Your computer is now ready to be powered on. Once the computer is powered on, you will need to adjust the settings in the BIOS setup utility to match the set-up of your system. Finally, you will need to install and boot an operating system, such as DOS, before your computer can be used. For further instructions, consult your operating system manual.
Chapter 4: BIOS Setup Program
The major functions of the BIOS are to check the hardware in your system each tune it is powered on and to act as an interface between the CPU and the other components and peripherals in the system. If you received your mainboard installed in a system, the BIOS setup has probably already been adjusted properly.
If you are installing the system board yourself or modifing the system hardware configuration, you will need to enter the setup information. To enter the AWARD BIOS setup program, power on the computer and press <Del> key immediately or simultaneously press < Ctrl >, < Alt >, and <Esc> keys. This Chapter explains how to use the Setup program and make the appropriate entries.
4.1 BIOS Features Setup
4.2 Chipset Features Setup
This portion of the BIOS Setup is entirely chip-set specific and requires knowledge about the chip set in use. These registers control most of the system options in the computer.
Figure 4.2: Chipset Features Setup Menu
4.3 Power Management Setup
Figure 4.3: Power Management Menu
4.4 PCI Configuration Setup
Since PCI is intended to be a plug & play technology, ideally no setup should be needed. However, there are many “dirty” PCI devices (PCI devices which do not follow the PCI 2.0 specification exactly) on the market. The Award setup utility is mainly for manual override of the IRQs of such dirty devices.
The most common “dirty” device is an IDE device. According to the PCI 2.0 specification, a single device can request only one IRQ. If a PCI IDE card is intended to support two IDE channels, two IRQs should be assigned to the card. Unless the card supports multi function operation, i.e., more than one and up to seven devices can be found on one card, the IDE card is “dirty”.
As another example, according to the PCI 2.0 specification, PCI devices should inform the system BIOS which INT line they are using. This is implemented by hardwiring the address ODh of the configuration space registers to a predefined value:
00-N/A
01-INT A
02-INT B
03- INT C
04-INTD
If a PCI device does not implement the above technique, it will confuse a pure plug & play BIOS and therefore it is a “dirty” device.
In addition, according to the PCI 2.0 specification, PCI devices should provide accurate configuration space registers so that the PCI BIOS can identify them. If a PCI device does not provide such a group of registers, it is a “dirty” device.
Figure 4.4: PCI Configuration Setup Menu
External PCI IDE Add-on CardSetup
Identifiable PCI IDE:
- Choose “PCI-Auto” for these cards and determine the INTs for primary as well as secondary channels by checking the IDE card manual.
PCI IDE with “Legacy Header” or no PCI IDE device: - Choose option “ISA” in item PCI IDE IRQ Map To.
Dirty PCI IDE without “Legacy Header” and without an accurate Cfg Space: - First, check which slot this card is plugged into and choose a PCI slot accordingly. Next, determine the INTs for the primary and secondary channels by checking the IDE card manual.
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