
ACER, INC.

486 SYSTEM (V20L)

Processor      AM486SX/80486SX/AM486DX/80486DX/CX486DX2/AM486DX2/
               80486DX2/P24D/P24T
Processor      25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set       Unidentified
Video Chip Set None
Maximum        48MB
Onboard Memory
Maximum Video  None
Memory
Cache          128/256/512KB
BIOS           Unidentified
Dimensions     330mm x 218mm
I/O Options    32-bit VESA local bus slot, floppy drive interface, green PC
               connector, IDE interfaces (2), parallel port, PS/2 mouse
               port, serial ports (2)
NPU Options    None

[Image]

                                CONNECTIONS

  Purpose             Location      Purpose                   Location

  Serial port 1          CN1        Power LED & keylock     CN9 pins 1 -
                                                                 4

  Serial port 2          CN2        Reset switch/green PC   CN9 pins 7 &
                                    connector                    8

  Parallel port          CN3        Power LED & keylock     CN10 pins 1 -
                                                                 5

  Floppy drive           CN4        Speaker                 CN10 pins 7 -
  interface                                                      10

  IDE interface 1        CN5        Turbo LED               CN10 pins 12
                                                                & 13

  IDE interface 2        CN6        Turbo switch            CN10 pins 15
                                                                - 17

  PS/2 mouse port        CN7        Reset switch            CN10 pins 19
                                                                & 20

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

                        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

      4MB           None           None       (1) 1M x 36

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

      8MB           None           None       (1) 2M x 36

     12MB       (1) 1M x 36    (1) 1M x 36    (1) 1M x 36

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

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

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

     16MB           None           None       (1) 4M x 36

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

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

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

                DRAM CONFIGURATION (CON'T)

     Size          Bank 0         Bank 1        Bank 2

     20MB           None       (1) 4M x 36    (1) 1M x 36

     20MB           None       (1) 1M x 36    (1) 4M x 36

     24MB       (1) 1M x 36    (1) 4M x 36    (1) 1M x 36

     24MB       (1) 1M x 36    (1) 1M x 36    (1) 4M x 36

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

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

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

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

     28MB       (1) 4M x 36    (1) 1M x 36    (1) 2M x 36

     28MB       (1) 1M x 36    (1) 4M x 36    (1) 2M x 36

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

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

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

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

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

     48MB       (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

                            CPU TYPE SELECTION

       Type               JP20              JP26               JP27

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

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

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

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

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

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

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

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

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

                        CPU TYPE SELECTION (CON'T)

      Type           JP33          JP34           JP35           JP37

    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

    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

    80486DX2      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

