
ACER, INC.

AP55CS

Device Type           Mainboard
Processor             CX 6X86/Pentium
Processor Speed       75/90/100/120/133/150/166MHz
Chip Set              SIS
Video Chip Set        Unidentified
Maximum Onboard       128MB (EDO supported) Unified Memory Architecture
Memory                (UMA)
Cache                 256KB
BIOS                  AMI
Dimensions            280mm x 220mm
I/O Options           32-bit PCI slots (3), floppy drive interface, IDE
                      interfaces (2), parallel port, serial ports (2), VGA
                      feature connector, VGA port, VRM connector
NPU Options           None

[Image]

                                CONNECTIONS

  Purpose               Location      Purpose                Location

  Serial port 1            CN1        IDE interface LED        JP16

  Serial port 2            CN2        Power LED &         JP24/pins 1  5
                                      keylock

  Floppy drive             CN3        Speaker              JP24/pins 7 
  interface                                                     10

  Parallel port            CN4        Turbo LED            JP24/pins 12 &
                                                                13

  IDE interface 2          CN5        Turbo switch        JP24/pins 15 
                                                          17

  IDE interface 1          CN6        Reset switch        JP24/pins 19 &
                                                          20

  VGA feature              CN7        32-bit PCI slots       PC1  PC3
  connector

  VGA port                 J3         VRM connector             VRM

  CPU fan power            J7

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Factory configured - do not           JP2          Unidentified
      alter

     Factory configured - do not           JP3          Unidentified
      alter

     Factory configured - do not           JP5          Unidentified
      alter

     Factory configured - do not           JP8          Unidentified
      alter

     Factory configured - do not          JP13          Unidentified
      alter

      On board I/O enabled                 JP14        Pins 1 & 2 closed

      On board I/O disabled                JP14        Pins 2 & 3 closed

     Factory configured - do not          JP17          Unidentified
      alter

     CMOS memory normal operation         JP19        Pins 1 & 2 closed

      CMOS memory clear                    JP19        Pins 2 & 3 closed

                SIMM CONFIGURATION

      Size            Bank 0           Bank 1

       2MB        (2) 256K x 36         None

       4MB        (2) 512K x 36         None

       4MB        (2) 256K x 36    (2) 256K x 36

       6MB        (2) 512K x 36    (2) 256K x 36

       8MB        (2) 512K x 36    (2) 512K x 36

       8MB         (2) 1M x 36          None

      10MB         (2) 1M x 36     (2) 256K x 36

      12MB         (2) 1M x 36     (2) 512K x 36

      16MB         (2) 2M x 36          None

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

      18MB         (2) 2M x 36     (2) 256K x 36

            SIMM CONFIGURATION (CONT)

      Size            Bank 0           Bank 1

      20MB         (2) 2M x 36     (2) 512K 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

      34MB         (2) 4M x 36     (2) 256K x 36

      36MB         (2) 4M x 36     (2) 512K 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

      66MB         (2) 8M x 36     (2) 256K x 36

      68MB         (2) 8M x 36     (2) 512K 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

  Note: Board accepts EDO memory.

      CACHE CONFIGURATION

      Size          Bank 0

     256KB       (2) 32K x 32

         CACHE TYPE CONFIGURATION

        Type                 JP1

     Linear mode      Pins 1 & 2 closed

   Interleave mode    Pins 2 & 3 closed

                       CPU SPEED SELECTION (CX 6X86)

    CPU        Clock     Multiplier     JP9     JP10      JP22     JP23
   speed      speed

  120MHz      50MHz          2x        2 & 3    2 & 3     Open     Open

  150MHz      60MHz          2x        2 & 3    1 & 2     Open     Open

  166MHz      66MHz          2x        1 & 2    2 & 3     Open     Open

  Note: Pins designated should be in the closed position.

                        CPU SPEED SELECTION (INTEL)

    CPU        Clock     Multiplier     JP9     JP10      JP22     JP23
   speed      speed

   75MHz      50MHz         1.5x       2 & 3    2 & 3    2 & 3     2 & 3

   90MHz      60MHz         1.5x       2 & 3    1 & 2    2 & 3     2 & 3

  100MHz      66MHz         1.5x       1 & 2    2 & 3    2 & 3     2 & 3

  120MHz      60MHz          2x        2 & 3    1 & 2    1 & 2     2 & 3

  133MHz      66MHz          2x        1 & 2    2 & 3    1 & 2     2 & 3

  150MHz      60MHz         2.5x       2 & 3    1 & 2    1 & 2     1 & 2

  166MHz      66MHz         2.5x       1 & 2    2 & 3    1 & 2     1 & 2

  Note: Pins designated should be in the closed position.

                    DMA CHANNEL SELECTION

       Channel               JP11                 JP12

          1            Pins 2 & 3 closed   Pins 2 & 3 closed

          3            Pins 1 & 2 closed   Pins 1 & 2 closed

                         ON BOARD VIDEO SELECTION

      Setting             JP4               JP6                JP7

      Enabled            Closed          Pins 1 & 2         Pins 2 & 3
                                           closed             closed

     Disabled             Open           Pins 2 & 3         Pins 3 & 4
                                           closed             closed

                  FLASH BIOS SELECTION

          Setting                      JP18

             5v              Pins 2 & 3, 5 & 6 closed

            12v              Pins 1 & 2, 5 & 6 closed

           EEPROM            Pins 2 & 3, 4 & 5 closed

