
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

