&KDSWHU System Board The V50LA is a high-performance system board with a 64-bit architecture. It supports the new Intel P54C, P54CQS, P54CS, P54CT, and P55C CPUs running at 75/90/100/120/133/150 MHz and utilizes the Peripheral Component Interconnect (PCI) local bus architecture. The PCI local bus maximizes the system performance by enabling high-speed peripherals to match the speed of the microprocessor with its 120 MB or 132 MB per second transfer rate in burst mode.
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1.1.1 Layout Figure 1-1 shows the locations of the system board major components. 1 2 3 4 5 6 7 8 9 10 Second-level cache Buzzer CPU voltage regulator Fan connector SIMM sockets 321-pin ZIF CPU socket 3.
1.1.2 Slot Board The system board comes with a slot board already installed. The slot board carries the PCI and ISA bus slots for system enhancements and future expansion. The slot board may vary in size and layout depending on your system housing. Figures 1-2 and 1-3 show the two kinds of slot boards.
1.2 Jumpers and Connectors 1.2.1 Jumper and Connector Locations Figure 1-4 shows the jumper and connector locations on the system board. Figure 1-4 System Board Jumper and Connector Locations Jumpers are prefixed “JP”. Connectors are prefixed “CN”. The blackened pin of a jumper represents pin 1.
1.2.2 Jumper Settings Table 1-1 lists the system board jumpers with their corresponding settings and functions.
Table 1-1 System Board Jumper Settings (continued) Jumper Setting CPU Type JP8 1-2* 2-3 CPU Core / Local Bus Clock Ratio JP16, JP19 LED Support JP23 Intel P54C or AMD K5 Cyrix M1 Intel P54C 1-2*, 1-2* 1-2, 2-3 2-3, 1-2 2-3, 2-3 CPU Voltage JP21 Function 1-2* 2-3 1-2 2-3* 3/2 2/1 3/1 5/2 Intel P55C M1 and K5 3/1 2/1 3/2, 2/1, 3/1 1/1 3.3825V for VR and standard CPU type 3.
1.2.3 Connector Functions Table 1-2 lists the different connectors on the system board and their respective functions.
The multifunction connector CN14 accommodates the front panel connectors for speaker, LEDs, keylock, reset, and turbo. Figure 1-5 shows the CN14 pin assignments for each of the front panel connectors. Figure 1-5 20-Pin Multifunction Connector (CN14) The connector CNX1 functions as SMM switch, as reset switch, or both, depending on the settings. Figure 1-6 shows the CNX1 settings with their corresponding functions.
1.3 ESD Precautions Always observe the following electrostatic discharge precautions before installing a system component: (ESD) 1. Do not remove a component from its antistatic packaging until you are ready to install it. 2. Wear a wrist grounding strap before handling electronic components. Wrist grounding straps are available at most electronic component stores. Do not attempt the procedures described in the following sections unless you are a qualified technician.
1.4 Memory Upgrade The system board comes with four 72-pin SIMM sockets that support 4-MB and 16-MB single-density SIMMs and 8-MB and 32-MB doubledensity SIMMs. Table 1-3 lists the possible memory configurations.
1.4.1 Installing a SIMM Follow these steps to install a SIMM: 1. Slip a SIMM at a 45° angle with the component side facing down into the socket labeled SIMM-1. Be careful when inserting SIMMs to avoid damaging the SIMM or the socket. 2. Gently press the SIMM up until the pegs of the socket fit into the holes on the SIMM and the holding clips lock the SIMM into position. The SIMM should be at a 90° angle when installed.
1.4.2 Removing a SIMM Follow these steps to remove a SIMM: 1. Press the holding clips on both sides of the SIMM outward to release it. Figure 1-8 Removing a SIMM 2. Move the SIMM to a 45° angle. 3. Pull the SIMM out of the socket. Always remove SIMMs from the socket labeled SIMM-4, then SIMM-3, and so on.
1.4.3 Reconfiguring the System You must enter Setup after installing or removing SIMMs to reconfigure the system. Follow these steps to reconfigure the system: 1. Turn the system on. A memory error message appears, indicating that the total memory does not match the value stored in CMOS. 2. Press E+D+A to enter Setup. A warning message appears indicating a wrong memory configuration. 3. Press Atwice to exit and reboot the system. The system boots with the new memory configuration. 1.
1.6 CPU Installation The system board comes with a zero-insertion force (ZIF) CPU socket for easy installation. Follow these steps to install a Pentium CPU: 1. Lift up the socket lever. 2. Insert the CPU to the socket. Make sure that the notched corner of the CPU matches the pin 1 indicator on the socket. Be careful not to bend any pins. 3. Pull down the socket lever. STEP 1 STEP 2 Notched Corner STEP 3 Figure 1-9 4.
1.7 Video Memory Upgrade Larger video memory allows you to display higher resolutions and more colors. The system board comes with a 1-MB video memory onboard upgradable to 2 MB. Follow these steps to upgrade the video memory: 1. Locate the video DRAM upgrade sockets labeled U5 and U6 on the system board. See Figure 1-1. 2. Gently insert a 514260ASL (256K x 16, 70ns SOJ) chip into each of the upgrade sockets. Make sure that the pin 1 indicator on the chip matches the notched corner of the socket.
1.8 Audio Functions and Options The system board supports Sound Blaster Pro-compatible sound system. It has four connectors onboard to accommodate the audioI/O board, WaveTable, CD-ROM, and fax-voice modem. Figure 1-11 shows the four audio connectors on the system board.
1.8.1 Audio-I/O Board Features The audio-I/O board consists of microphone port, line-in port, line-out port, and MIDI/game port. These ports accommodate the external audio devices. The system board supports two types of audio-I/O board. Figures 1-12 and 1-13 show the different audio-I/O boards that may come with the system.
Microphone Connector Microphone Port Line-in Connector Line-in Port Line-out Port MIDI/Game Port Line-out Connector Figure 1-13 Audio-I/O Board With Internal Connectors The audio-I/O board with internal connectors is particularly useful for system housings with built-in speakers, microphone, amplifier, or auxiliary devices. With the internal audio connectors functioning exactly as the external audio ports, you can utilize all the sound features supported by the system board.
1.8.2 Audio-I/O Devices Figure 1-14 shows the various devices that you can connect to the audio-I/O board.
1.9 Error Messages Do not continue using the computer if you receive an error message of any type. Note the message and take corrective action. This section explains the different types of error messages and corresponding corrective measures. There are two general types of error messages: • • Software System 1.9.1 Software Error Messages Software error messages are returned by your operating system or application.
Table 1-5 System Error Messages Message Action CMOS Battery Error Replace the RTC chip or contact your dealer. CMOS Checksum Error Check the RTC chip and the necessary jumper. If the battery is still good, run Setup. Display Card Mismatch Run Setup Diskette Drive Controller Error or Not Installed Check and connect the control cable to the diskette controller. Diskette Drive Error Diskette may be defective. If not, replace the diskette drive.
Table 1-5 System Error Messages (continued) Message Memory Error at: MMMM:SSSS:OOO (W:XXXX, R:YYYY) Action Check SIMMs on the system board. Contact your dealer. where: M: MB, S: Segment, O: Offset, X/Y: write/read pattern CPU Clock Mismatch Run Setup. Check if the CPU clock is correct. If correct, exit Setup and reboot the system. If the error message reappears, ask for technical assistance. Onboard Serial Port 1 Conflict Run Setup and disable the port.
1.9.3 Correcting Error Conditions As a general rule, if an error message says "Press F1 to continue," it is caused by a configuration problem, which can be easily corrected. An equipment malfunction is more likely to cause a fatal error, i.e., an error that causes complete system failure. Here are some corrective measures for error conditions: 1. Run Setup.
