DYNA MICRO, INC.

MBA-486AI-33, 50

Processor         80486SX/80487SX/80486DX
Processor Speed   16/20/25/33/50MHz
Chip Set          SIS
Max. Onboard DRAM 32MB
Cache             64/128/256KB
BIOS              AMI/Award
Dimensions        330mm x 218mm
I/O Options       32-bit external memory card slot
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                 Location

  External battery            BAT       Reset switch              RST

  32-bit external memory      CN1       Speaker                   SPK
  card

  Power LED & keylock         KEY       Turbo switch              TSW

  Turbo LED                   LED

                        USER CONFIGURABLE SETTINGS

               Function                     Jumper           Position

  »   Power good signal detect from          JP1            pins 1 & 2
      power supply                                            closed

      Power good signal detect from          JP1            pins 2 & 3
      board                                                   closed

                            DRAM CONFIGURATION

     Size         Bank 0          Bank 1         Bank 2         Bank 3

     1MB        (4) 256K x 9       NONE           NONE           NONE

     2MB        (4) 256K x 9   (4) 256K x 9       NONE           NONE

     4MB        (4) 1M x 9         NONE           NONE           NONE

     6MB        (4) 256K x 9   (4) 256K x 9    (4) 1M x 9        NONE

     8MB        (4) 1M x 9      (4) 1M x 9        NONE           NONE

     10MB       (4) 256K x 9   (4) 256K x 9    (4) 1M x 9     (4) 1M x 9

     12MB       (4) 1M x 9      (4) 1M x 9     (4) 1M x 9        NONE

     16MB       (4) 1M x 9      (4) 1M x 9     (4) 1M x 9     (4) 1M x 9

     16MB       (4) 4M x 9         NONE           NONE           NONE

     18MB       (4) 256K x 9   (4) 256K x 9    (4) 4M x 9        NONE

     20MB       (4) 1M x 9      (4) 4M x 9        NONE           NONE

     24MB       (4) 1M x 9      (4) 1M x 9     (4) 4M x 9        NONE

     32MB       (4) 4M x 9      (4) 4M x 9        NONE           NONE

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

     40MB       (4) 1M x 9      (4) 1M x 9     (4) 4M x 9     (4) 4M x 9

     48MB       (4) 4M x 9      (4) 4M x 9     (4) 4M x 9        NONE

     64MB       (4) 4M x 9      (4) 4M x 9     (4) 4M x 9     (4) 4M x 9

  Note:Banks 2 and 3 are used when a 32-bit external memory card is
  installed at CN1.

                    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 RESISTOR CONFIGURATION

      Size              R1               R2              R3

      64KB          Installed      Not installed    Not installed

      128KB       Not installed      Installed      Not installed

      256KB       Not installed    Not installed      Installed

                          CPU TYPE CONFIGURATION

   Type      SW1/1      SW1/2      SW1/3     SW1/4      SW1/5     SW1/6

  80486SX     Off        Off        Off       Off        On         On

  80487SX     Off         On        On         On        Off        On

  80486DX      On         On        On         On        On         On

                   CPU SPEED CONFIGURATION

        Speed                JP2                  JP3

        16MHz          pins 1 & 2 closed   pins 1 & 2 closed

        20MHz          pins 1 & 2 closed   pins 1 & 2 closed

        25MHz          pins 2 & 3 closed   pins 1 & 2 closed

        33MHz          pins 2 & 3 closed   pins 1 & 2 closed

        50MHz          pins 2 & 3 closed   pins 2 & 3 closed