
UNIDENTIFIED

486EI VESA/EISA (VER. 1.0)

Processor              80486SX/80487SX/80486DX/80486DX2/P23/P24T
Processor Speed        20/25/33/50(internal)/50/66(internal)MHz
Chip Set               Unidentified
Video Chip Set         None
Maximum Onboard Memory 256MB
Maximum Video Memory   None
Cache                  64/128/256/512KB
BIOS                   AMI/Phoenix
Dimensions             332mm x 221mm
I/O Options            32-bit VESA local bus slots (3)
NPU Options            None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  Reset switch                J6        Turbo switch              J22

  Speaker                     J8        Turbo LED                 J24

  Power LED & keylock         J9        32-bit VESA local      SL1 - SL3
                                        bus slots

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

      Monitor type select color                J7             Closed

      Monitor type select monochrome           J7              Open

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1         Bank 2         Bank 3

      1MB        (1) 256K x        None           None           None
                     36

      2MB        (1) 256K x     (1) 256K x        None           None
                     36             36

      2MB        (1) 512K x        None           None           None
                     36

      4MB        (1) 256K x     (1) 256K x     (1) 512K x        None
                     36             36             36

      4MB        (1) 512K x        None        (1) 512K x        None
                     36                            36

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

      6MB        (1) 256K x     (1) 256K x    (1) 1M x 36        None
                     36             36

      6MB        (1) 512K x        None       (1) 1M x 36        None
                     36

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

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

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

     10MB        (1) 512K x        None       (1) 1M x 36    (1) 1M x 36
                     36

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

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

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

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

     18MB        (1) 256K x     (1) 256K x    (1) 4M x 36        None
                     36             36

     18MB        (1) 512K x        None       (1) 4M x 36        None
                     36

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

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

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

     34MB        (1) 512K x        None       (1) 4M x 36    (1) 4M x 36
                     36

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

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

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

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

     64MB       (1) 16M x 36       None           None           None

     128MB      (1) 16M x 36   (1) 16M x 36       None           None

     192MB      (1) 16M x 36   (1) 16M x 36   (1) 16M x 36       None

     256MB      (1) 16M x 36   (1) 16M x 36   (1) 16M x 36   (1) 16M x 36

  Note: The location of banks 0 & 1 are unidentified.

                  CACHE CONFIGURATION

       Size             Bank 0             Bank 1

       64KB           (4) 8K x 8         (4) 8K x 8

      128KB           (4) 32K x 8           None

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

      512KB          (4) 128K x 8           None

  Note: The location of banks 0 & 1 are unidentified.

                        CACHE JUMPER CONFIGURATION

  Size     JC1     JC2     JC3      JC4     JC5     JC6     JC7     JC9

  64KB     1 & 2   1 & 2   1 & 2   1 & 2   1 & 2   1 & 2   1 & 2   2 & 3

  128KB    2 & 3   2 & 3   1 & 2   1 & 2   1 & 2   1 & 2   2 & 3   1 & 2

  256KB    2 & 3   2 & 3   2 & 3   1 & 2   1 & 2   2 & 3   2 & 3   4 & 5

  512KB    2 & 3   2 & 3   2 & 3   2 & 3   2 & 3   2 & 3   2 & 3   1 & 2

  Note: Pins designated should be in the closed position.

                       CPU SPEED SELECTION

   Speed       JL2        JO1        JO2        JO3       JO4

   20MHz      Open       Open      Closed     Closed     Closed

   25MHz      Open      Closed      Open      Closed     Closed

   33MHz      Open      Closed     Closed      Open      Closed

  50iMHz      Open      Closed      Open      Closed     Closed

   50MHz     Closed      Open       Open       Open       Open

  66iMHz      Open      Closed     Closed      Open      Closed

                            CPU TYPE SELECTION

       Type                J1                J2                 J3

      80486SX             Open              Open            Pins 2 & 3
                                                              closed

      80487SX            Closed          Pins 2 & 3         Pins 1 & 2
                                           closed             closed

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

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

       P23T              Closed          Pins 2 & 3         Pins 1 & 2
                                           closed             closed

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

