
MICROMEDIA TECHNOLOGIES, INC.

486-VLA

Processor        80486SX/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       230mm x 218mm
I/O Options      32-bit VESA local bus slots (3)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Speaker                     J1       External battery            J6

  Power LED & keylock         J2       32-bit VESA Local bus       S1
                                       slot

  Reset switch                J3       32-bit VESA Local bus       S2
                                       slot

  Turbo LED                   J4       32-bit VESA Local bus       S3
                                       slot

  Turbo switch                J5

              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 JUMPER CONFIGURATION

    Size         JP21          JP22           JP23             JP24

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

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

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

  Note:Pins designated should be in the closed position.

                          CPU SPEED CONFIGURATION

  Speed    JP6     JP10     JP25/pins    JP25/pins     JP25/pins    JP26
                              1&2           3&4          5&6

  25MHz    Pins    Pins       Open        Closed         Open      Pins 1
           1 & 2   1 & 2                                            & 2

  33MHz    Pins    Pins      Closed        Open         Closed     Pins 1
           1 & 2   1 & 2                                            & 2

  40MHz    Pins    Pins      Closed       Closed         Open      Pins 2
           2 & 3   2 & 3                                            & 3

   50i     Pins    Pins       Open        Closed         Open      Pins 1
   MHz     1 & 2   1 & 2                                            & 2

  50MHz    Pins    Pins       Open        Closed         Open      Pins 2
           2 & 3   2 & 3                                            & 3

   66i     Pins    Pins      Closed        Open         Closed     Pins 1
   MHz     1 & 2   1 & 2                                            & 2

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

    Type      JP7      JP9     JP11      JP12     JP16     JP17     JP20

  80486SX     Pins     Pins   Closed    Closed     Pins    N/A     Pins 1
              1 & 2   1 & 2                       1 & 2             & 2

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

  80487DX     Pins     Pins   Closed    Closed     Pins    Pins    Pins 1
              1 & 2   1 & 2                       2 & 3    2 & 3    & 2

  80486DX2    Pins     Pins    Open      Open      Pins    N/A     Pins 1
              2 & 3   2 & 3                       1 & 2             & 2

  Note: Pins designated should be in the closed position.

                  VESA WAIT STATE/BUS SPEED CONFIGURATION

    CPU speed        Wait states            JP1                JP2

       33MHz       0 wait states        Pins 1 & 2         Pins 1 & 2
                                          closed             closed

      > 33MHz        1 wait state        Pins 2 & 3         Pins 2 & 3
                                          closed             closed

