SER(itech)

486-VLA

Processor        CX486M6/80486SX/80487SX/80486DX/80486DX2
Processor Speed  25/33/40/50(internal)/50/66(internal)MHz
Chip Set         ALI
Max. Onboard DRAM32MB
Cache            64/128/256KB
BIOS             AMI
Dimensions       254mm x 218mm
I/O Options      32-bit VESA local bus slots (3)
NPU Options      None



                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Speaker                     J1       Turbo switch                J5

  Power LED & keylock         J2       External battery            J6

  Reset switch                J3       32-bit VESA local bus   SL1 - SL3
                                       slots

  Turbo LED                   J4

              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

      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

                        CACHE JUMPER CONFIGURATION

      Size           JP21          JP22          JP23           JP24

      64KB          1 & 2          1 & 2         Open           3 & 4

     128KB          2 & 3          1 & 2         Open       1 & 2, 3 & 4,
                                                                5 & 6

     256KB          1 & 2          1 & 2         1 & 2      1 & 2, 3 & 4,
                                                                5 & 6

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

    Type      JP7    JP9      JP11       JP12     JP16     JP17     JP20

  CX486M6     2 &     2 &     Open       Open     1 & 2    Open    1 & 2
               3      3

  80486SX     1 &     1 &    Closed     Closed    1 & 2    Open    1 & 2
               2      2

  80487SX     1 &     1 &    Closed     Closed    2 & 3    1 & 2   1 & 2
               2      2

  80486DX     1 &     1 &    Closed     Closed    2 & 3    2 & 3   1 & 2
               2      2

  80486DX2    1 &     1 &    Closed     Closed    2 & 3    2 & 3   1 & 2
               2      2

  Note: Pins designated should be in the closed position.

                          CPU SPEED CONFIGURATION

     Speed           JP6           JP10           JP25           JP26

     25MHz          1 & 2         1 & 2          3 & 4          1 & 2

     33MHz          1 & 2         1 & 2       1 & 2, 5 & 6      1 & 2

     40MHz          2 & 3         2 & 3       1 & 2, 3 & 4      2 & 3

     50iMHz         1 & 2         1 & 2          3 & 4          1 & 2

     50MHz          2 & 3         2 & 3          3 & 4          2 & 3

     66iMHz         1 & 2         1 & 2       1 & 2, 5 & 6      1 & 2

  Note: Pins designated should be in the closed position.

      VESA WAIT STATE CONFIGURATION

     Wait states             JP1

    0 wait states     pins 1 & 2 closed

    1 wait state      pins 2 & 3 closed

         BUS SPEED CONFIGURATION

      CPU speed              JP2

      <= 33MHz        pins 1 & 2 closed

       > 33MHz        pins 2 & 3 closed