
ACER, INC.

V55-2

Device Type           Mainboard
Processor             Pentium/Pentium MMX/ CX 6x86/AM K5/IBM 6x86
Processor Speed       75/90/100/120/133/150/166/200 MHz
Chip Set              Unidentified
Maximum Onboard       128MB (EDO & SDRAM supported)
Memory
Cache                 256/512KB
BIOS                  Unidentified
Dimensions            254mm x 218mm
I/O Options (CPU)     32-bit ISA slots (3), 32-bit PCI slots (4), bus mouse
                      port, PS/2 keyboard port, serial ports (2), parallel
                      port

[Image]

                                CONNECTIONS

  Purpose               Location      Purpose                 Location

  Standby power            CN1        Speaker               CN16/pins 7 -
  connector                                                      10

  Serial port 2            CN2        Turbo LED            CN16/pins 12 &
                                                                 13

  Serial port 1            CN3        Reset                CN16/pins 19 &
                                                                 20

  Parallel port            CN4        External suspend          CN17
                                      switch

  Floppy drive             CN5        Software shutdown         CN18
  interface                           switch

  IDE interface 2          CN6        IrDA connector            CN19

  IDE interface 1          CN9        IDE interface LED         CN20

  CPU power               CN13        PS/2 mouse port           CN21
  shorting block

  CPU fan connector       CN14        32-bit PCI              PC1-PC4
                                      expansion slots

  Keylock             CN16/pins 1 &   Cache slot                SL1
                            2

  Power LED           CN16/pins 3 -
                            5

                        USER CONFIGURABLE SETTINGS

             Function                  Label             Position

     ROM type select Flash ROM         JP4          Pins 2 & 3 closed

      ROM type select EPROM             JP4          Pins 1 & 2 closed

     CPU core voltage select           JP6          Pins 2 & 3 closed
      2.8v

      CPU core voltage select           JP6          Pins 1 & 2 closed
      3.2v

     CPU I/O voltage select 3.3v       JP7          Pins 2 & 3 closed

      CPU I/O voltage select 3.5v       JP7          Pins 1 & 2 closed

     Factory configured - do not      JP10          Pins 2 & 3 closed
      alter

      CMOS discharge normal            JP11                Open

      CMOS discharge clear             JP11               Closed

                            ROM BRAND SELECTION

                 Brand                                  JP5

                  29EE010                       Pins 2 & 3 closed

                     NC                          Pins 1 & 2 closed

                   29F001                        Pins 3 & 4 closed

             SIMM CONFIGURATION

     Size          Bank 0        Bank 1

      8MB        (2) 1M x 32      None

     16MB        (2) 2M x 32      None

     16MB        (2) 1M x 32   (2) 1M x 32

     24MB        (2) 2M x 32   (2) 1M x 32

     32MB        (2) 4M x 32      None

     32MB        (2) 2M x 32   (2) 2M x 32

     40MB        (2) 4M x 32   (2) 1M x 32

     48MB        (2) 4M x 32   (2) 2M x 32

     64MB        (2) 8M x 32      None

     64MB        (2) 4M x 32   (2) 4M x 32

     72MB        (2) 8M x 32   (2) 1M x 32

     80MB        (2) 8M x 32   (2) 2M x 32

     96MB        (2) 8M x 32   (2) 4M x 32

     128MB       (2) 8M x 32   (2) 8M x 32

                      CACHE CONFIGURATION

      Size            SL1             Tag           Bank 0

     256KB       (2) 32K x 32    (8) 32K x 32    (2) 32K x 32

     512KB       (4) 32K x 32    (8) 32K x 32    (4) 32K x 32

     512KB       (2) 64K x 32    (8) 32K x 32    (2) 64K x 32

  Note: The location of Tag SRAM is unidentified.

                        CACHE JUMPER CONFIGURATION

           Size                       JP8                    JP9

            256KB             Pins 2 & 3 closed      Pins 2 & 3 closed

             512KB             Pins 1 & 2 closed      Pins 1 & 2 closed

                      CPU FREQUENCY SELECTION (INTEL)

    CPU       Clock       Clock     SW1/1     SW1/2     SW1/3     SW1/4
              Speed      Ratio

   75MHz      50MHz       1.5x       Off       Off       On         On

   90MHz      60MHz       1.5x       Off       Off       Off        On

  100MHz      66MHz       1.5x       Off       Off       On        Off

  120MHz      60MHz        2x        Off       On        Off        On

  133MHz      66MHz        2x        Off       On        On        Off

  150MHz      60MHz       2.5x       On        On        Off        On

  166MHz      66MHz       2.5x       On        On        On        Off

                    CPU FREQUENCY SELECTION (INTEL MMX)

    CPU       Clock       Clock     SW1/1     SW1/2     SW1/3     SW1/4
              Speed      Ratio

  166MHz      66MHz       2.5x       On        On        On        Off

  180MHz      60MHz        3x        On        Off       Off        On

  200MHz      66MHz        3x        On        Off       On        Off

                      CPU FREQUENCY SELECTION (AM K5)

    CPU       Clock       Clock     SW1/1     SW1/2     SW1/3     SW1/4
              Speed      Ratio

   75MHz      50MHz       1.5x       Off       Off       On         On

   90MHz      60MHz       1.5x       Off       Off       Off        On

  100MHz      66MHz       1.5x       Off       Off       On        Off

  120MHz      60MHz        2x        Off       On        Off        On

  133MHz      66MHz        2x        Off       On        On        Off

  150MHz      60MHz       2.5x       On        On        Off        On

  166MHz      66MHz       2.5x       On        On        On        Off

                     CPU FREQUENCY SELECTION (CX 6X86)

    CPU        Host      Clock     SW1/1      SW1/2     SW1/3     SW1/4
               Bus       Ratio

  120MHz      50MHz       2x        Off        On        On         On

  150MHz      60MHz       2x        Off        On        Off        On

  166MHz      66MHz       2x        Off        On        On        Off

                    CPU FREQUENCY SELECTION (IBM 6X86)

    CPU        Host      Clock     SW1/1      SW1/2     SW1/3     SW1/4
               Bus       Ratio

  120MHz      50MHz       2x        Off        On        On         On

  150MHz      60MHz       2x        Off        On        Off        On

  166MHz      66MHz       2x        Off        On        On        Off

