
ACER, INC.

486 SYSTEM (V20)

Processor  AM486SX/(SL)AM486SX/80486SX/AM486DX/(SL)AM486DX/80486DX/CX486DX2/AM486DX2(SL)AM486DX2/80486DX2/AM486DX4/
           (SL)AM486DX4/80486DX4/P24D/P24T
Processor  25/33/40/50(internal)/50/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set   Unidentified
Video Chip None
Set
Maximum    64MB
Onboard
Memory
Maximum    None
Video
Memory
Cache      128/256/512KB
BIOS       Unidentified
Dimensions 330mm x 218mm
I/O        32-bit VESA local bus slot, 32-bit PCI slots (3), floppy drive interface, green PC connector, IDE
Options    interfaces (2), parallel port, PS/2 mouse port, serial ports (2)
NPU        None
Options

[Image]

                                CONNECTIONS

  Purpose             Location      Purpose                   Location

  Serial port 1          CN1        Reset switch/green PC   CN9 pins 7 &
                                    connector                    8

  Serial port 2          CN2        Power LED & keylock     CN10 pins 1 -
                                                                 5

  Parallel port          CN3        Speaker                 CN10 pins 7 -
                                                                 10

  Floppy drive           CN4        Turbo LED               CN10 pins 12
  interface                                                     & 13

  IDE interface 1        CN5        Turbo switch            CN10 pins 15
                                                                - 17

  IDE interface 2        CN6        Reset switch            CN10 pins 19
                                                                & 20

  PS/2 mouse port        CN7        32-bit PCI slots         PC1 - PC3

  IDE interface          CN8        32-bit VESA local bus       SL1
  LED                               slots

  Power LED &        CN9 pins 1 -
  keylock                 4

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Password disabled                     JP1        Pins 2 & 3 closed

      Password enabled                      JP1        Pins 1 & 2 closed

     OEM BIOS enabled                      JP2        Pins 2 & 3 closed

     Factory configured - do not           JP2        Pins 1 & 2 closed
      alter

     M5115 I/O enabled                     JP8        Pins 1 & 2 closed

      M5115 I/O disabled                    JP8        Pins 2 & 3 closed

      Jumper information unidentified       JP10         Unidentified

     Local bus IDE I/O address             JP11       Pins 1 & 2 closed
      select 0FXH

      Local bus IDE I/O address             JP11       Pins 2 & 3 closed
      select 07XH

     M5213N local bus IDE enabled          JP12       Pins 2 & 3 closed

      M5213N local bus IDE disabled         JP12       Pins 1 & 2 closed

     Reset key enabled                     JP23       Pins 1 & 2 closed

      Reset key disabled                    JP23       Pins 2 & 3 closed

     Green PC connector enabled            JP24       Pins 2 & 3 closed

      Reset switch enabled                  JP24       Pins 1 & 2 closed

     Factory configured - do not           JP41       Pins 2 & 3 closed
      alter

                           DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2        Bank 3

     4MB           None           None           None       (1) 1M x 36

     8MB        (1) 2M x 36       None           None          None

     8MB           None           None       (1) 1M x 36    (1) 1M x 36

     8MB           None           None       (1) 2M x 36       None

     12MB       (1) 2M x 36       None       (1) 1M x 36       None

     12MB       (1) 2M x 36       None           None       (1) 1M x 36

     12MB          None       (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

     12MB       (1) 1M x 36       None       (1) 2M x 36       None

     12MB          None       (1) 1M x 36    (1) 2M x 36       None

     16MB       (1) 2M x 36       None       (1) 2M x 36       None

     16MB       (1) 2M x 36       None       (1) 1M x 36    (1) 1M x 36

                       DRAM CONFIGURATION (CONT)

     Size         Bank 0         Bank 1         Bank 2        Bank 3

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

     16MB          None           None           None       (1) 4M x 36

     16MB       (1) 1M x 36   (1) 1M x 36    (1) 2M x 36       None

     24MB       (1) 2M x 36       None       (1) 4M x 36       None

     24MB       (1) 2M x 36       None           None       (1) 4M x 36

     24MB       (1) 4M x 36       None       (1) 2M x 36       None

     24MB          None       (1) 4M x 36    (1) 2M x 36       None

     28MB       (1) 2M x 36       None       (1) 4M x 36    (1) 1M x 36

     28MB       (1) 2M x 36       None       (1) 1M x 36    (1) 4M x 36

     28MB       (1) 4M x 36   (1) 1M x 36    (1) 2M x 36       None

     28MB       (1) 1M x 36   (1) 4M x 36    (1) 2M x 36       None

     32MB          None           None       (1) 4M x 36    (1) 4M x 36

     40MB       (1) 2M x 36       None       (1) 4M x 36    (1) 4M x 36

     40MB       (1) 4M x 36   (1) 4M x 36    (1) 2M x 36       None

     48MB          None       (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

     64MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36    (1) 4M x 36

                      CACHE CONFIGURATION

      Size          Bank 0          Bank 1           TAG

     128KB        (4) 32K x 8        None        (1) 32K x 8

     256KB        (4) 32K x 8     (4) 32K x 8    (1) 32K x 8

     512KB       (4) 128K x 8        None        (1) 32K x 8

                        CACHE JUMPER CONFIGURATION

      Size              JP13               JP15               JP16

      128KB           Pins 2 & 3        Pins 2 & 3      Pins 1 & 2 closed
                       closed             closed

      256KB           Pins 2 & 3        Pins 1 & 2      Pins 2 & 3 closed
                       closed             closed

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

                     CPU SPEED SELECTION

        Speed                JP17                 JP21

        25MHz          Pins 1 & 5 closed   Pins 2 & 3 closed

        33MHz          Pins 2 & 6 closed   Pins 2 & 3 closed

        40MHz          Pins 3 & 7 closed   Pins 1 & 2 closed

       50iMHz          Pins 1 & 5 closed   Pins 2 & 3 closed

        50MHz          Pins 4 & 8 closed   Pins 1 & 2 closed

       66iMHz          Pins 2 & 6 closed   Pins 2 & 3 closed

       75iMHz          Pins 1 & 5 closed   Pins 2 & 3 closed

       100iMHz         Pins 2 & 6 closed   Pins 2 & 3 closed

                            CPU TYPE SELECTION

       Type             JP9          JP20          JP26          JP27

      AM486SX        Pins 2 & 3    Pins 1 & 2   Pins 1 & 2     Pins 1 & 2
                      closed        closed        closed        closed

    (SL)AM486SX      Pins 1 & 2    Pins 1 & 2   Pins 1 & 2     Pins 1 & 2
                      closed        closed        closed        closed

      80486SX        Pins 2 & 3    Pins 1 & 2   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

      AM486DX        Pins 2 & 3    Pins 1 & 2   Pins 1 & 2     Pins 1 & 2
                      closed        closed        closed        closed

    (SL)AM486DX      Pins 1 & 2    Pins 1 & 2   Pins 1 & 2     Pins 1 & 2
                      closed        closed        closed        closed

      80486DX        Pins 2 & 3    Pins 1 & 2   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

     CX486DX2        Pins 2 & 3    Pins 1 & 2   Pins 2 & 3       Open
                      closed        closed        closed

     AM486DX2        Pins 2 & 3    Pins 1 & 2   Pins 1 & 2     Pins 1 & 2
                      closed        closed        closed        closed

   (SL)AM486DX2      Pins 1 & 2    Pins 1 & 2   Pins 1 & 2     Pins 1 & 2
                      closed        closed        closed        closed

     80486DX2        Pins 2 & 3    Pins 1 & 2   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

     AM486DX4        Pins 2 & 3    Pins 1 & 2   Pins 1 & 2     Pins 1 & 2
                      closed        closed        closed        closed

   (SL)AM486DX4      Pins 1 & 2    Pins 1 & 2   Pins 1 & 2     Pins 1 & 2
                      closed        closed        closed        closed

     80486DX4        Pins 2 & 3    Pins 1 & 2   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

       P24D          Pins 2 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

       P24T          Pins 2 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

                        CPU TYPE SELECTION (CONT)

       Type            JP33          JP34          JP35          JP37

      AM486SX        Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

    (SL)AM486SX      Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

      80486SX        Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

      AM486DX        Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

    (SL)AM486DX      Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

      80486DX        Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

     CX486DX2        Pins 2 & 4    Pins 1 & 2   Pins 2 & 3     Pins 1 & 2
                      closed        closed        closed        closed

     AM486DX2        Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

   (SL)AM486DX2      Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

     80486DX2        Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

     AM486DX4        Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

   (SL)AM486DX4      Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

     80486DX4        Pins 1 & 3    Pins 2 & 3   Pins 2 & 3     Pins 2 & 3
                      closed        closed        closed        closed

       P24D          Pins 1 & 3    Pins 2 & 3   Pins 1 & 2     Pins 2 & 3
                      closed        closed        closed        closed

       P24T          Pins 1 & 3    Pins 2 & 3   Pins 1 & 2     Pins 2 & 3
                      closed        closed        closed        closed

                 CPU MULTIPLIER SELECTION (80486DX4 ONLY)

              Multiplier                             JP22

                    2x                         Pins 3 & 4 closed

                   2.5x                        Pins 2 & 3 closed

                    3x                         Pins 1 & 2 closed

