AMERICAN MEGATRENDS, INC.

SERIES 64 BABY EISA

Processor             80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed       20/25/33/50(internal)/50/66(internal)MHz
Chip Set              OPTI
Max. Onboard DRAM     128MB
Cache                 64/256KB
BIOS                  AMI
Dimensions            330mm x 218mm
I/O Options           Mouse port
NPU Options           None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                   Location

  Mouse                       J2       Power LED & keylock         J30

  Speaker                    J22       Reset switch                J31

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

  »   CPU speed select iOSC/2                J3              pins 1 & 2
                                                               closed

      CPU speed select iOSC/1                J3              pins 2 & 3
                                                               closed

  »   Channel ready signal select            J29                Open
      IOCHRDY (ISA only)

      Channel ready signal select            J29               Closed
      EXRDY (EISA only)

  »   Factory configured - do not           SW1/1               Off
      alter

  »   Monitor type select                   SW1/2               Off
      monochrome

      Monitor type select color             SW1/2                On

             DRAM CONFIGURATION

     Size          Bank 0        Bank 1

      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

     64MB        (4) 16M x 9      NONE

     128MB       (4) 16M x 9   (4) 16M x 9

                 CACHE JUMPER CONFIGURATION

   Size      J14        J15       J18       J19      J28

   64KB      Open      Open      Open      Open     2 & 3

  256KB     1 & 2      1 & 2     1 & 2     1 & 2    1 & 2

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

          Type                   Location                    J9

         80486SX                  Primary            pins 2 & 3 closed

        OPD486SX                  Upgrade             pins 1 & 2, 3 & 4
                                                           closed

         80487SX                  Upgrade             pins 1 & 2, 3 & 4
                                                           closed

         80486DX                  Primary             pins 1 & 2, 3 & 4
                                                           closed

        80486DX2                  Primary             pins 1 & 2, 3 & 4
                                                           closed

                          CPU SPEED CONFIGURATION

     Speed           J6            J16           J17             J27

     20MHz         Closed         Open           Open         pins 2 & 3
                                                               closed

     25MHz          Open          Open           Open         pins 1 & 2
                                                               closed

     33MHz          Open          Open          Closed        pins 1 & 2
                                                               closed

    50iMHz          Open          Open           Open         pins 1 & 2
                                                               closed

     50MHz          Open         Closed         Closed        pins 1 & 2
                                                               closed

    66iMHz          Open          Open          Closed        pins 1 & 2
                                                               closed