
ACER, INC.

V20-486 ALL IN ONE

Processor   AM486/80486SX/80486DX/80486DX2/80486DX4/P24D/P24T
Processor   25/33/50(internal)/66(internal)/75(internal)/100(internal)MHz
Speed
Chip Set    ALI
Video Chip  None
Set
Maximum     Unidentified
Onboard
Memory
Maximum     None
Video
Memory
Cache       128/256/512KB
BIOS        Acer
Dimensions  330mm x 218mm
I/O Options 32-bit VESA local bus slot, 32-bit PCI slots (2), 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 2            CN1        Reset switch        CN9 pins 7 & 8

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

  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      PC11 - PC3

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

  Power LED &          CN9 pins 1 -
  keylock                   4

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

     Password enabled                         J1           Pins 1 & 2
                                                              closed

      Password disabled                        J1           Pins 2 & 3
                                                              closed

     BIOS type select Acer                    J2           Pins 1 & 2
                                                              closed

      BIOS type select OEM                     J2           Pins 2 & 3
                                                              closed

     Factory configured - do not alter        J3           Pins 3 & 4
                                                              closed

     Factory configured - do not alter        J4             Closed

     Factory configured - do not alter        J6           Pins 2 & 3
                                                              closed

     Factory configured - do not alter        J7           Pins 2 & 3
                                                              closed

     M5115 I/O enabled                        J8           Pins 1 & 2
                                                              closed

      M5115 I/O disabled                       J8           Pins 2 & 3
                                                              closed

     Factory configured - do not alter       J10           Pins 1 & 2
                                                              closed

     Local bus IDE I/O address select        J11           Pins 1 & 2
      0FXH                                                    closed

      Local bus IDE I/O address select        J11           Pins 2 & 3
      07XH                                                    closed

     Local bus IDE enabled                   J12           Pins 2 & 3
                                                              closed

      Local bus IDE disabled                  J12           Pins 1 & 2
                                                              closed

     Reset switch enabled                    J23           Pins 1 & 2
                                                              closed

      Reset switch disabled                   J23           Pins 2 & 3
                                                              closed

     Green PC connector disabled             J24           Pins 1 & 2
                                                              closed

      Green PC connector enabled              J24           Pins 2 & 3
                                                              closed

                   DRAM CONFIGURATION

  Note: The maximum amount of memory is unidentified.

                      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               J13               J15                 J16

      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

       50iMHz          Pins 1 & 5 closed   Pins 2 & 3 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                  J9                  J20

   Intel S-series      Pins 2 & 3 closed   Pins 1 & 2 closed

        P24D           Pins 1 & 2 closed   Pins 2 & 3 closed

        P24T           Pins 1 & 2 closed   Pins 2 & 3 closed

                      CPU TYPE SELECTION

        Type                 J26                  J27

        Intel          Pins 1 & 2 closed   Pins 1 & 2 closed

         AMD           Pins 2 & 3 closed   Pins 2 & 3 closed

         CPU MULTIPLIER SELECTION

     Multiplier              J22

         2x           Pins 3 & 4 closed

        2.5x          Pins 2 & 3 closed

         3x           Pins 1 & 2 closed

