
ACHME COMPUTER, INC.

MS-4131 VLB 486 AL2

Processor        80486SX/80487SX/80486DX/80486DX2
Processor Speed  25/33/40/50(internal)/50/66(internal)MHz
Chip Set         ALI
Max. Onboard DRAM112MB
Cache            128/256KB
BIOS             AMI
Dimensions       254mm x 218mm
I/O Options      32-bit VESA local bus slots (3)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            JB        32-bit VESA Local bus      S2
                                        slot

  32-bit VESA Local bus       S1        32-bit VESA Local bus      S3
  slot                                  slot

                  PIN OUT CONFIGURATION

          Connector
                                         JFP

           Keylock
                                  pins 1 & 2 closed

          Power LED
                                  pins 3 & 5 closed

          Turbo LED
                                 pins 12 & 13 closed

        Turbo switch
                               pins 15, 16, & 17 closed

            Reset
                                 pins 19 & 20 closed

           Speaker
                              pins 7, 8, 9, & 10 closed

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not             JC1           pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JC2           pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JC3           pins 1 & 2
      alter                                                   closed

     Factory configured - do not             JC5             Closed
      alter

     Factory configured - do not             JC7           pins 1 & 2
      alter                                                   closed

     CPU PQFP not installed                  JC8             Closed

      CPU PQFP installed                      JC8              Open

     Factory configured - do not             JC9              N/A
      alter

     Factory configured - do not             JC10             Open
      alter

     Monitor type select monochrome          JP1           pins 1 & 2
                                                              closed

      Monitor type select color               JP1           pins 2 & 3
                                                              closed

     Factory configured - do not             JP4              N/A
      alter

                            CACHE CONFIGURATION

      Size
                      Bank 0
                                      Bank 1
                                                            TAG

      128KB
                   (4) 32K x 8
                                       NONE
                                                     (1)8K x 8/(1)16K x
                                                       8/(1)32K x 8

      256KB
                   (4) 32K x 8
                                   (4) 32K x 8
                                                  (1) 16K x 8/(1) 32K x 8

                  CACHE JUMPER CONFIGURATION

        Size                 JS1                  JS2

        64KB           pins 2 & 3 closed   pins 2 & 3 closed

        128KB          pins 1 & 2 closed   pins 1 & 2 closed

        256KB          pins 1 & 2 closed   pins 1 & 2 closed

                    CPU TYPE CONFIGURATION

        Type
                             JC4
                                                  JC6

       80486SX
                       pins 1 & 2 closed
                                                 Open

       80487SX
                       pins 2 & 3 closed
                                           pins 1 & 2 closed

       80486DX
                       pins 2 & 3 closed
                                           pins 2 & 3 closed

      80486DX2
                       pins 2 & 3 closed
                                           pins 2 & 3 closed

                          CPU SPEED CONFIGURATION

   Speed         JK1         JK2        JK3          JK4           JP2

   25MHz      3 & 7 and    pins 1 &   pins 1 &      Closed       pins 1 &
                4 & 8         2          2                          2

   33MHz      1 & 2 and    pins 1 &   pins 1 &      Closed       pins 1 &
                4 & 8         2          2                          2

   40MHz      1 & 5 and    pins 2 &   pins 2 &      Closed       pins 2 &
                2 & 6         3          3                          3

  50i MHz     3 & 7 and    pins 1 &   pins 1 &      Closed       pins 1 &
                4 & 8         2          2                          2

   50MHz       pins 2 &    pins 2 &   pins 2 &       Open        pins 2 &
                  6           3          3                          3

  66i MHz     1 & 2 and    pins 1 &   pins 1 &      Closed       pins 1 &
                4 & 8         2          2                          2

  Note:Pins designated should be in the closed position.

                VESA WAIT STATE/BUS SPEED CONFIGURATION

    CPU speed
                     Wait states
                                     JP4/pins 1 & 2
                                                       JP4/pins 3 & 4

     <= 33MHz
                    0 wait states
                                          Open
                                                            Open

      > 33MHz
                    1 wait state
                                         Closed
                                                           Closed

                      DRAM CONFIGURATION

      Size          Bank 0          Bank 1          Bank 2

      1MB        (4) 256K x 9        None            None

      4MB            None         (1) 1M x 36        None

      4MB            None            None        (1) 1M x 36

      4MB         (4) 1M x 9         None            None

      5MB        (4) 256K x 9     (1) 1M x 36        None

      5MB        (4) 256K x 9        None        (1) 1M x 36

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

      8MB            None         (1) 2M x 36        None

      8MB            None            None        (1) 2M x 36

      9MB        (4) 256K x 9     (1) 2M x 36        None

      9MB        (4) 256K x 9        None        (1) 2M x 36

      12MB        (4) 1M x 9      (1) 2M x 36        None

      12MB        (4) 1M x 9         None        (1) 2M x 36

      16MB        (4) 4M x 9         None            None

      16MB        (4) 4M x 9      (1) 1M x 36        None

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

      16MB        (4) 4M x 9         None        (1) 1M x 36

      24MB        (4) 4M x 9      (1) 2M x 36        None

      24MB        (4) 4M x 9         None        (1) 2M x 36

      32MB           None         (1) 4M x 36        None

      32MB           None            None        (1) 4M x 36

      33MB       (4) 256K x 9     (1) 4M x 36        None

      33MB       (4) 256K x 9        None        (1) 4M x 36

      36MB        (4) 1M x 9      (1) 4M x 36        None

      36MB        (4) 1M x 9         None        (1) 4M x 36

      48MB        (4) 4M x 9      (1) 4M x 36        None

      48MB        (4) 4M x 9         None        (1) 4M x 36

                  DRAM CONFIGURATION (CONT.)

      Size
                    Bank 0
                                    Bank 1
                                                    Bank 2

      64MB
                     None
                                  (1) 8M x 36
                                                     None

      64MB
                     None
                                  (1) 4M x 36
                                                 (1) 4M x 36

      64MB
                     None
                                     None
                                                 (1) 8M x 36

      65MB
                 (4) 256K x 9
                                     None
                                                 (1) 8M x 36

      65MB
                 (4) 256K x 9
                                  (1) 8M x 36
                                                     None

      68MB
                  (4) 1M x 9
                                  (1) 8M x 36
                                                     None

      68MB
                  (4) 1M x 9
                                     None
                                                 (1) 8M x 36

      88MB
                  (4) 4M x 9
                                     None
                                                 (1) 8M x 36

      88MB
                  (4) 4M x 9
                                  (1) 8M x 36
                                                     None

      96MB
                     None
                                  (1) 8M x 36
                                                 (1) 4M x 36

      97MB
                 (4) 256K x 9
                                  (1) 8M x 36
                                                 (1) 4M x 36

     100MB
                  (4) 1M x 9
                                  (1) 8M x 36
                                                 (1) 4M x 36

     112MB
                  (4) 4M x 9
                                  (1) 8M x 36
                                                 (1) 4M x 36

