ACER, INC.

V55

Device Type          Mainboard
Processor            CX M1/AM K5/Pentium
Processor Speed      75/90/100/120/133/150/166/200MHz
Chip Set             Unidentified
Video Chip Set       None
Maximum Onboard      128MB (EDO supported)
Memory
Maximum Video Memory None
Cache                256/512KB
BIOS                 Unidentified
Dimensions           254mm x 218mm
I/O Options          32-bit PCI slots (4), floppy drive interface, green PC
                     connector, IDE interfaces (2), parallel port, PS/2
                     mouse port, serial ports (2), cache slot, IR
                     connector, USB connector
NPU Options          None

[Image]

                                CONNECTIONS

  Purpose               Location      Purpose                Location

  Standby power            CN1        Power LED &         CN16/pins 1 – 5
  connector                           keylock

  Serial port 2            CN2        Speaker              CN16/pins 7 –
                                                                10

  Serial port 1            CN3        Green PC LED         CN16/pins 12 &
                                                                13

  Parallel port            CN4        Reset switch         CN16/pins 19 &
                                                                20

  Floppy drive             CN5        Green PC                 CN17
  interface                           connector

  IDE interface 2          CN6        Software shutdown        CN18
                                      switch

  IDE interface 1          CN9        IR connector             CN19

  PS/2 mouse port         CN11        IDE interface LED        CN20

  USB connector           CN12        32-bit PCI slots       PC1 – PC4

  CPU power shorting      CN13        Cache slot                SL1
  block

  CPU fan power           CN14

                        USER CONFIGURABLE SETTINGS

               Function
                                            Label
                                                            Position

  »
      BIOS type select flash
                                             JP4
                                                        Pins 2 & 3 closed


      BIOS type select EPROM
                                             JP4
                                                        Pins 1 & 2 closed

             SIMM CONFIGURATION

     Size          Bank 0        Bank 1

      8MB        (2) 1M x 36      None

     16MB        (2) 2M x 36      None

     16MB        (2) 1M x 36   (2) 1M x 36

     24MB        (2) 2M x 36   (2) 1M x 36

     32MB        (2) 4M x 36      None

     32MB        (2) 2M x 36   (2) 2M x 36

     40MB        (2) 4M x 36   (2) 1M x 36

     48MB        (2) 4M x 36   (2) 2M x 36

     64MB        (2) 8M x 36      None

     64MB        (2) 4M x 36   (2) 4M x 36

     72MB        (2) 8M x 36   (2) 1M x 36

     80MB        (2) 8M x 36   (2) 2M x 36

     96MB        (2) 8M x 36   (2) 4M x 36

     128MB       (2) 8M x 36   (2) 8M x 36

                            CACHE CONFIGURATION

          Size
                                  Bank 0
                                                            SL1

          256KB
                               (2) 32K x 32
                                                       Not installed

          512KB
                               (2) 32K x 32
                                                   256KB module installed

                  CACHE JUMPER CONFIGURATION

        Size                 JP8                  JP9

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

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

            CACHE TYPE CONFIGURATION

          Type
                                 JP10

    » M1 1 + 4 mode
                           Pins 2 & 3 closed

  M1 linear burst mode
                           Pins 1 & 2 closed

       CPU CLOCK FREQUENCY SELECTION

  Clock speed       S1/3          S1/4

     50MHz           On            On

     60MHz          Off            On

     66MHz           On            Off

   CPU BUS RATIO SELECTION (CYRIX)

  Bus ratio
                 S1/1
                             SW1/2

      1
                  On
                              On

      2
                 Off
                              On

      3
                 Off
                              Off

      4
                  On
                              Off

    CPU BUS RATIO SELECTION (AMD)

  Bus ratio      S1/1        SW1/2

      2           On          On

      2          Off          On

     3/2          On          Off

     3/2         Off          Off

   CPU BUS RATIO SELECTION (INTEL)

  Bus ratio
                 S1/1
                             SW1/2

      2
                 Off
                              On

      3
                  On
                              Off

     3/2
                 Off
                              Off

     5/2
                  On
                              On

                           CPU VOLTAGE SELECTION

      Voltage           V core             JP6                 JP7

      » 3.3v             2.8v           Pins 2 & 3      Pins 2 & 3 closed
                                          closed

       3.5v              2.5v           Pins 1 & 2      Pins 1 & 2 closed
                                          closed

              BIOS SELECTION

        Type
                             JP5

         NC
                      Pins 1 & 2 closed

      » 29E010
                      Pins 2 & 3 closed

       28F001
                      Pins 3 & 4 closed