
ACER, INC.

486 VESA SYSTEM (VER. 2)

Processor        80486SX/80486DX/80486DX2
Processor Speed  20/25/33/40/50(internal)/50/66(internal)MHz
Chip Set         Unidentified
Video Chip Set   None
Maximum Onboard  64MB
Memory
Maximum Video    None
Memory
Cache            128/256KB
BIOS             Unidentified
Dimensions       330mm x 218mm
I/O Options      32-bit VESA local bus slots (2), floppy drive interface,
                 IDE interface, SCSI connector, parallel port, PS/2 mouse
                 port, serial ports (2)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose               Location     Purpose                   Location

  PS/2 mouse port         CN1        IDE interface               CN8

  HDD/FDD power           CN2        VGA control connector        J4
  connector for EPA                  for EPA

  SCSI interface          CN3        Chassis fan power            J9

  Parallel port           CN4        Front panel LEDs            J10

  Serial port 1           CN5        Auxiliary                   J11
                                     keyboard/PS/2 mouse

  Serial port 2           CN6        IDE interface LED           J12

  Floppy drive            CN7        32-bit VESA local bus    SL1 & SL2
  interface                          slots

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

      Jumper information unavailable        CN9          Unidentified

     Password check disabled               JP1        Pins 2 & 3 closed

      Password check enabled                JP1        Pins 1 & 2 closed

      Jumper information unavailable        JP2          Unidentified

      SCSI IRQ select IRQ10                 JP3        Pins 1 & 2 closed

      SCSI IRQ select IRQ11                 JP3        Pins 2 & 3 closed

      SCSI IRQ disabled                     JP3              Open

     Factory configured - do not           JP4              Open
      alter

     Factory configured - do not           JP5              Open
      alter

      SCSI I/O address select 340h -        JP6              Open
      35Fh

      SCSI I/O address select 140h -        JP6             Closed
      15Fh

      Onboard M5105 disabled                JP7              Open

      Onboard M5105 enabled                 JP7             Closed

     Parallel port bidirectional           JP8             Closed
      enabled

      Parallel port bidirectional           JP8              Open
      disabled

      Battery type select internal          JP9             Closed

      Battery type select external          JP9              Open

      Reset button disabled                 JP23             Open

      Reset button enabled                  JP23            Closed

      Keylock enabled                       JP24             Open

      Keylock disabled                      JP24            Closed

                            DRAM CONFIGURATION

    Size       Bank 0A      Bank 0      Bank 1      Bank 2       Bank 3

    4MB          4MB         None        None        None         None

    8MB          4MB         None       (1) 1M x     None         None
                                          36

    12MB         4MB         None       (1) 1M x    (1) 1M x      None
                                          36          36

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

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

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

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

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

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

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

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

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

  Note: If Bank 0 is populated, Bank 0A needs to be disabled with JP15..

        DRAM JUMPER CONFIGURATION

        Size                 JP15

         4MB          Pins 2 & 3 closed

         8MB          Pins 2 & 3 closed

        12MB          Pins 2 & 3 closed

      16MB (A)        Pins 2 & 3 closed

      16MB (B)        Pins 1 & 2 closed

        20MB          Pins 2 & 3 closed

        24MB          Pins 2 & 3 closed

        32MB          Pins 1 & 2 closed

        36MB          Pins 2 & 3 closed

        40MB          Pins 2 & 3 closed

        48MB          Pins 1 & 2 closed

        64MB          Pins 1 & 2 closed

                    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

                        CACHE JUMPER CONFIGURATION

      Size               JP20               JP21               JP22

      128KB           Pins 1 & 2           Closed              Open
                        closed

      256KB           Pins 2 & 3           Closed             Closed
                        closed

            CPU SPEED SELECTION

        Speed                 JP10

        20MHz           Pins 1 & 6 closed

        25MHz           Pins 2 & 7 closed

        33MHz           Pins 3 & 8 closed

        40MHz           Pins 4 & 9 closed

        50iMHz          Pins 2 & 7 closed

        50MHz          Pins 5 & 10 closed

        66iMHz          Pins 3 & 8 closed

                        VL BUS WAIT STATE SELECTION

               Setting                                JP11

                    0                                Open

                     1                               Closed

