UNIDENTIFIED

U486 (ML-U486DX50/33HS/V1)

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 LED                  J11

  Speaker                      J8       Reset switch               J12

  Power LED & keylock          J9       Turbo switch               JP1

  Turbo switch                J10

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

  »   Battery type select internal           J1             Closed

      Battery type select external           J1              Open

  »   NPU synchronous with CPU               J5        Pins 2 & 3 closed

      NPU asynchronous with CPU              J5        Pins 1 & 2 closed

  »   Monitor type select color              J6             Closed

      Monitor type select monochrome         J6              Open

  »   Factory configured - do not            J7          Unidentified
      alter

  »   CMOS memory normal operation          J13        Pins 1 & 2 closed

      CMOS memory clear                     J13        Pins 2 & 3 closed

  »   Factory configured - do not            W4          Unidentified
      alter

              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 (33MHZ CPU)

       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. The speed
            for the cache is 15ns and 25ns for the TAG.

                      CACHE CONFIGURATION (50MHZ CPU)

       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. The speed
            for the cache is 15ns and 20ns for the TAG.

                        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 SELECTION

  Setting       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

          TURBO SELECTION

  Setting       J10        JP1

  Enabled     Closed       Open

  Disabled     Open       Closed