
UNIDENTIFIED

U486

Processor              80486SX/80487SX/80486DX
Processor Speed        33/50MHz
Chip Set               UMC
Video Chip Set         None
Maximum Onboard Memory 32MB
Maximum Video Memory   None
Cache                  64/128/256KB
BIOS                   AMI
Dimensions             254mm x 218mm
I/O Options            None
NPU Options            None

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  External battery             J3       Turbo switch               J10

  Speaker                      J8       Turbo LED                  J11

  Power LED & keylock          J9       Reset switch               J12

                        USER CONFIGURABLE SETTINGS

                 Function                     Label          Position

     Battery type select internal              J1            Closed

      Battery type select external              J1             Open

     Keyboard clock select synchronous         J5           Pins 2 & 3
                                                              closed

      Keyboard clock select asynchronous        J5           Pins 1 & 2
                                                              closed

     Monitor type select color                 J6            Closed

      Monitor type select monochrome            J6             Open

     CMOS memory normal operation             J13           Pins 1 & 2
                                                              closed

      CMOS memory clear                        J13           Pins 2 & 3
                                                              closed

     Turbo sped disabled                      JP1            Closed

      Turbo speed enabled                      JP1             Open

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       None

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         None

      5MB         (4) 256K x 9    (4) 1M x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         None

      20MB        (4) 1M x 9      (4) 4M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8

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

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

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

                        CACHE JUMPER CONFIGURATION

   Size    W1     W2      W3    W5      W6       W7        W8       W9

   64KB    1 &   Open     1 &   1 &    Open     Open      Open     Open
            2             2     2

  128KB    2 &   1 & 2    1 &   2 &   Closed    Open      Open     Closed
            3             2     3

  256KB    1 &   2 & 3    2 &   2 &   Closed    Closed   Closed    Closed
            2             3     3

  Note: Pins designated should be in the closed position.

  CPU CLOCK MODE SELECTION

    Speed           W10

      1x           Open

      2x          Closed

                            CPU TYPE SELECTION

          Type                     W11                      W12

         80486SX            Pins 2 & 3 closed               Open

         80487SX             Pins 1 & 2, 3 & 4       Pins 2 & 3 closed
                                  closed

         80486DX             Pins 1 & 2, 3 & 4       Pins 1 & 2 closed
                                  closed

