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Acer V55LA-2 User Manual

High-performance system board
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& K D S W H U

System Board

The V55LA-2 is a high-performance system board with a 64-bit
architecture. It supports the Intel P54C and P55C CPUs running at
75/90/100/120/133/150/166/200 MHz. It also supports Cyrix M1/M2
and AMD K5/K6 CPUs.
The system board utilizes the Peripheral
Component Interconnect (PCI) local bus architecture that 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.
The board incorporates a Sound Blaster Pro-compatible audio
subsystem that consists of CD-audio, WaveTable, and fax/modem
line-in interfaces.
A standard 1-MB video DRAM comes onboard and is upgradable up to
2 MB. Two DRAM banks composed of four 72-pin sockets come with
the board to support single- and double-density SIMMs for a maximum
system memory of 128 MB. The SIMM sockets accommodate both
the standard page mode and extended data output (EDO) type
SIMMs. The board supports 256-KB or 512-KB pipeline burst second-
level cache.
The system board includes a 188-pin connector for the slot board that
contains the PCI and ISA bus slots. The two onboard PCI-enhanced
IDE interfaces with a zero-wait state and 16.6 MB per second transfer
rate support up to four IDE devices. Onboard I/O interfaces comprise
of two UART 16550 serial ports, a parallel port with ECP/EPP feature,
and PS/2 keyboard and mouse ports.
System Board



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  Summary of Contents for Acer V55LA-2

  • Page 1: System Board

    & K D S W H U System Board The V55LA-2 is a high-performance system board with a 64-bit architecture. It supports the Intel P54C and P55C CPUs running at 75/90/100/120/133/150/166/200 MHz. It also supports Cyrix M1/M2 and AMD K5/K6 CPUs.
  • Page 2: Major Features

    Major Features The system board has the following major features: A zero-insertion force (ZIF) socket for Intel P54C and P55C, Cyrix M1/M2, or AMD K5/K6 Two DRAM banks composed of four 72-pin SIMM sockets that support 4/8/16/32-MB 60/70ns SIMMs 256-KB or 512-KB write-back pipeline burst second-level cache (manufacturing option) 256-KB boot block mode Flash ROM for system BIOS, VGA BIOS, and PnP ESCD...
  • Page 3 1.1.1 System Board Figure 1-1 shows the locations of the system board major components. Battery Tag SRAM Pipeline burst second-level cache Pentium CPU socket CPU voltage regulators SIMM sockets Buzzer Switch 2 (SW2) Video RAM upgrade sockets Video RAM Figure 1-1 System Board Layout System Board Video port...
  • Page 4 1.1.2 Slot Boards 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.
  • Page 5: Jumper And Connector Locations

    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 The blackened pin of a jumper represents pin 1. System Board...
  • Page 6: Jumper Settings

    JP11 Software Shutdown JP16 CPU Voltage JP43 (for I/O) JP44 (for core) Function For models with Acer BIOS For models with OEM BIOS LED for IDE and FDD LED for IDE only 256 KB 512 KB 1 MB For single-voltage CPUs (P54C, K5, M1)
  • Page 7 Tables 1-2 to 1-4 show the settings of DIP switch 2 (SW2), JP7, JP43, and JP44 for CPU selection. Table 1-2 SW2, JP7, JP43, and JP44 Settings CPU Freq. Host Bus (MHz) Freq. (MHz) SW1 SW2 SW3 SW4 Intel P54C P100 P120 P133...
  • Page 8 Table 1-2 SW2, JP7, JP43, and JP44 Settings (continued) CPU Freq. Host Bus (MHz) Freq. (MHz) SW1 SW2 SW3 SW4 AMD K5 PR75 PR90 PR100 PR120 PR133 PR166 AMD K6 PR166 PR200 PR233 Table 1-3 SW2 Settings (Onboard Sound Chip) Setting 5 Onboard sound chip disabled Onboard sound chip enabled...
  • Page 9: Connector Functions

    1.2.3 Connector Functions Table 1-5 lists the different connectors on the system board and their respective functions. Table 1-5 Connector Functions Connector Feature connector for multimedia or Ethernet solution CD-audio line-in connector Power connector USB connector WaveTable connector PS/2 keyboard connector PS/2 mouse connector Audio I/O board connector CN10...
  • Page 10: Esd Precautions

    Table 1-5 Connector Functions (continued) Connector CN31 Internal line-in connector JP48 Hard disk and message LED (pins 1-3-5) Power LED (pins 2-4-6) JP50 Power-on switch connector JP15 Standby power connector JP30 External battery connector See section 1.10.1 for details on power and LED cables to the connector JP48.
  • Page 11: Memory Upgrade

    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 double- density SIMMs. Table 1-6 lists the possible 64-bit memory configurations. Table 1-6 Memory Configurations (64-bit) Bank 0 SIMM-1 SIMM-2 SIMM-3...
  • Page 12 The system also supports 32-bit memory configurations. This feature allows you to install only one SIMM in one configuration. Table 1-7 shows the 32-bit configurations. Table 1-7 Memory Configurations (32-bit) Bank 0 SIMM-1 SIMM-2 SIMM-3 4 MB 4 MB 4 MB 4 MB 4 MB 4 MB...
  • Page 13: Installing A Simm

    1.4.1 Installing a SIMM Follow these steps to install a SIMM: Carefully slip a SIMM at a 45 angle into a socket making sure that the curved edge indicating the pin 1 of the SIMM matches pin 1 of the socket. A SIMM fits only in one direction.
  • Page 14: Removing A Simm

    1.4.2 Removing a SIMM Follow these steps to remove a SIMM: Press the holding clips on both sides of the SIMM outward to release it. Move the SIMM to a 45 angle. Pull the SIMM out of the socket. Figure 1-6 Removing a SIMM Always remove SIMMs from the socket labeled SIMM-4, then SIMM-3, and so on.
  • Page 15: Reconfiguring The System

    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: Turn the system on. A memory error message appears, indicating that the total memory does not match the value stored in CMOS.
  • Page 16: Cpu Installation

    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: Lift up the socket lever. Insert the CPU to the socket. Make sure that the notched corner of the CPU matches the pin 1 indicator on the socket.
  • Page 17: Video Memory Upgrade

    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: Locate the video DRAM upgrade sockets labeled U39 and U40 on the system board.
  • Page 18: Second-Level Cache Configuration

    Second-level Cache Configuration The system board supports either 256-KB or 512-KB pipeline burst second-level cache. The cache size onboard is a manufacturing option. Table 1-9 shows the second-level cache configurations. Table 1-9 Second-level Cache Configurations Cache Size Onboard 256 KB 32K * 32 (7 ns) x 2 512 KB 64K * 32 (6 ns) x 2...
  • Page 19: Audio Features

    Audio Features The system board supports Sound Blaster Pro-compatible sound system. It has four connectors onboard to accommodate the audio- I/O board, WaveTable, CD-ROM, and fax-voice modem. You may disable the audio feature in the BIOS Utility. Figure 1-9 shows the four audio connectors on the system board. Audio-I/O board connector (CN9) WaveTable connector (CN6) CD audio connector (CN2)
  • Page 20 1.9.1 Installing the Audio-I/O Board The connector CN9 on the system board accommodates the audio-I/O board. Figure 1-10 shows how to install the board. Figure 1-10 Installing the Audio-I/O Board 1-20 User’s Guide...
  • Page 21 1.9.2 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. Microphone Connector Line-in Connector Microphone Port Line-in Port Line-out Port MIDI/Game Port Figure 1-11 Audio-I/O Board The internal connectors on the audio-I/O board are useful for system housings with built-in speakers, microphone, amplifier, or auxiliary devices.
  • Page 22 1.9.3 WaveTable Daughterboard (Optional) The system board supports a WableTable daughterboard as option. The WaveTable does not come with the basic system. WaveTable daughterboard connectors as the audio-I/O board but comes with enhanced audio features. It bundles the Crystal chipsets that work together to produce better sound quality.
  • Page 23 The WaveTable has two connectors, CN5 and CN6, located underside. Match these two connectors with the audio-I/O connector (CN9) and WaveTable connector (CN6) on the system board. Figure 1-13 shows how to install the WaveTable connector. Figure 1-13 Installing the WaveTable Daughterboard System Board 1-23...
  • Page 24 1.9.4 Audio-I/O Devices Figure 1-14 shows the various devices that you can connect to the audio-I/O board. Joystick Synthesizer Figure 1-14 Audio I/O External Devices 1-24 MIDI Adapter Speakers Head phones Stereo Amplifier CD Player Microphone User’s Guide...
  • Page 25 1.10 QuickStart Power Saving Feature The system board supports a special power saving feature called QuickStart mode. QuickStart turns off the hard disk, monitor, keyboard, and mouse once you press the power switch for less than four seconds while the system is on. This feature requires the Power Saving Operation Mode parameter in the BIOS to be set to...
  • Page 26 Power HDD/MSG Figure 1-15 Power and HDD/MSG Connector (JP48) Figure 1-16 shows the locations of JP48 and JP50 on the system board and which cables to connect to them. Power LED Cable Figure 1-16 Connecting the Power Switch and LED Cables 1-26 Power Switch Cable HDD/MSG LED Cable...
  • Page 27 1.10.2 QuickStart Mode Operation At any time while the system is running, enter the QuickStart mode by simply pressing the power switch for less the four seconds. action causes the system to rest (QuickStart state 1) by turning off the keyboard, mouse, and monitor.
  • Page 28: Installing Isa Cards

    1.11 Installing ISA Cards Both PnP and non-PnP ISA cards require specific IRQs. installing ISA cards, make sure that the IRQs required by these cards are not previously assigned to PCI devices to avoid resource conflicts. Follow these steps when installing ISA cards: 1.
  • Page 29: Software Error Messages

    1.12 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 1.12.1...
  • Page 30 Table 1-10 System Error Messages Message CMOS Battery Error CMOS Checksum Error Display Card Mismatch Diskette Drive Controller Error or Not Installed Diskette Drive Error Diskette Drive A Type Mismatch Diskette Drive B Type Mismatch Equipment Configuration Error Hard disk Controller Error Hard disk 0 Error Hard disk 1 Error Keyboard Error or No...
  • Page 31 Table 1-10 System Error Messages (continued) Message Memory Error at: MMMM:SSSS:OOO (W:XXXX, R:YYYY) where: M: MB, S: Segment, O: Offset, X/Y: write/read pattern CPU Clock Mismatch Onboard Serial Port 1 Conflict Onboard Serial Port 2 Conflict Onboard Parallel Port Conflict Pointing Device Error Pointing Device Interface Error...
  • Page 32: Correcting Error Conditions

    1.12.3 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.