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Acer M1A User Manual

High-performance pentium pci-based system board
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System Board

The M1A is a high-performance Pentium PCI-based system board
that supports the 64-bit Pentium microprocessor running at
75/90/100/120/133/150/166 MHz and has a 16-KB internal write-back
cache. It 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 100/120/132 MB per second transfer
rate in burst mode.
The board has two memory banks composed of two 72-pin SIMM
sockets each that support a maximum system memory of 128 MB
using 32-MB SIMMs.
upgradable to 2 MB for a higher video resolution.
The system board features a slot for the PCI/ISA slot board and two
Mode 4 PCI enhanced IDE interfaces that support up to four IDE
devices. A 50-pin Fast SCSI-II interface with 10 MB/s transfer rate
come with the system board to connect SCSI devices.
Standard I/O features such as two serial ports (COM1, COM2), one
parallel port, a diskette drive interface, and PS/2 mouse and keyboard
connectors reside on the system board.
System Board
The onboard 1-MB video memory is
      
      
      
      
1-1

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  Summary of Contents for Acer M1A

  • Page 1: System Board

    System Board The M1A is a high-performance Pentium PCI-based system board that supports the 64-bit Pentium microprocessor running at 75/90/100/120/133/150/166 MHz and has a 16-KB internal write-back cache. It utilizes the Peripheral Component Interconnect (PCI) local bus architecture. The PCI local bus maximizes the system...
  • Page 2: Major Features

    Major Features The system board has the following major features: Pentium 75/90/100/120/133/150/166 MHz CPU in an SPGA 296- pin zero-insertion force (ZIF) socket Two DRAM banks composed of four 72-pin SIMM sockets that support 4/8/16/32-MB 60/70ns SIMMs 16-KB internal cache (CPU) 256-KB synchronous or asynchronous second-level cache 128-KB Flash ROM for system BIOS and VGA BIOS EISA-type connector for the slot board that contains two PCI and...
  • Page 3 1.1.1 Layout Figure 1-1 shows the locations of the system board major components. 1 Keyboard controller 2 Real-time clock (RTC) 3 Flash ROM BIOS 4 Buzzer 5 Fan connectors 6 SIMM sockets 7 CPU socket 8 Synchronous cache (optional) 9 CPU voltage regulator Asynchronous cache VGA BIOS Figure 1-1...
  • Page 4 1.1.2 Slot Board The system board comes with a slot board already installed. The slot board carries two PCI and three 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 Jumpers are prefixed “JP”. Connectors are prefixed “CN”. The blackened pin of a jumper represents pin 1.
  • Page 6: Jumper Settings

    Open CPU Voltage Reserved 2-3* Reserved JP14 Open* Function For models with Acer BIOS For models with OEM BIOS Enable password Disable password 50 MHz (Pentium 75 MHz) 60 MHz (Pentium 90/120/150 MHz) 66 MHz (Pentium 100/133/166 MHz) VR (3.3V ± 5% - 0%) VRE (3.45V ~ 3.6V)
  • Page 7: Connector Functions

    Table 1-1 System Board Jumper Settings (continued) Jumper Setting CPU Type JX1, JP8 2-3, 1-2 2-3, 2-3 JX1, JP8 1-2, 1-2 1-2, 2-3 JP10 JP11 JP12 JP13 1.2.3 Connector Functions Table 1-2 lists the different connectors on the system board and their respective functions.
  • Page 8: Esd Precautions

    Table 1-2 Connector Functions (continued) Connector CN13 HDD LED connector CN14 Speaker connector CN15 Multifucntion connector CN16 Buzzer (pins 1-2) Speaker (pins 2-3) ESD Precautions Always observe following precautions before installing a system component: Do not remove a component from its antistatic packaging until you are ready to install it.
  • Page 9: Memory Upgrade

    Memory Upgrade The system board comes with four 72-pin SIMM sockets that support 4-MB and 16-MB single-density SIMMs as well as 8-MB and 32-MB double-density SIMMs. When using 32-MB SIMMs, the sockets support a maximum system memory of 128 MB. Table 1-3 lists the possible memory configurations.
  • Page 10: Memory Configurations

    1.4.2 Memory Configurations Table 1-3 Memory Configurations Bank 0 4 MB 4 MB 4 MB 8 MB 8 MB 8 MB 4 MB 4 MB 4 MB 4 MB 4 MB 8 MB 8 MB 8 MB 4 MB 8 MB 8 MB 8 MB 16 MB...
  • Page 11: Installing A Simm

    1.4.3 Installing a SIMM Follow these steps to install a SIMM: Slip a SIMM at a 45 angle with the component side facing down into the socket labeled S5. Be careful when inserting SIMMs to avoid damaging the SIMM or the socket. 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.
  • Page 12: Removing A Simm

    1.4.4 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 1-12 User’s Guide...
  • Page 13: Reconfiguring The System

    1.4.5 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 14: 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 into the socket. corner of the CPU matches the pin 1 indicator on the socket. Be careful not to bend any pins.
  • Page 15: 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 U10 and U11 on the system board.
  • Page 16: Software Error Messages

    Error Messages Do not continue using the computer if you receive an error message of any type. Note the message and take corrective action. section explains the different types of error messages and corresponding corrective measures. There are two general types of error messages: Software System 1.8.1...
  • Page 17 Table 1-5 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 18 Table 1-5 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 Memory Size Mismatch CPU Clock Mismatch Onboard Serial Port 1 Conflict Onboard Serial Port 2 Conflict Onboard Parallel Port Conflict Pointing Device Error Pointing Device Interface...
  • Page 19: Correcting Error Conditions

    1.8.3 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.