INFOMATIC POWER SYSTEMS CORPORATION

486 EISA BABY SIZE

Processor         80486SX/80487SX/80486DX/80486DX2
Processor Speed   20/25/33/50/66(internal)MHz
Chip Set          OPTI
Max. Onboard DRAM 128MB
Cache             64/128/256/512KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Speaker                      J4       Turbo LED                  J7

  Power LED & keylock          J5       Reset switch               S9

  Turbo switch                 J6

                        USER CONFIGURABLE SETTINGS

                 Function                     Jumper         Position

  »   External BCLK buffering 80486DX           JP1          pins 1 & 2
      (33/50MHz)                                              closed

      External BCLK buffering                   JP1          pins 2 & 3
      80486SX/80487SX (20/25MHz)                              closed

  »   Cache bank select single                  JP2          pins 1 & 2
      (128/512KB)                                             closed

      Cache bank select double                  JP2          pins 2 & 3
      (64/256KB)                                              closed

  »   Snooping/Flush 20MHz CPU                  JP8           Closed

      Snooping/Flush > 20MHz CPU                JP8            Open

  »   Monitor type select color                 JP9           Closed

      Monitor type select monochrome            JP9            Open

  »   CPU clock mode select single             JP12          pins 1 & 2
      frequency                                               closed

      CPU clock mode select double             JP12          pins 2 & 3
      frequency                                               closed

             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 CONFIGURATION

          Size                    Bank 0                   Bank 1

          64KB                  (4) 8K x 8               (4) 8K x 8

          128KB                    NONE                 (4) 32K x 8

          256KB                (4) 32K x 8              (4) 32K x 8

          512KB                    NONE                 (4) 128K x 8

  Note:In order to configure cache to 512KB, board needs to be
  specifically ordered. The difference will be that Bank 1 will be made
  up of 4 32-pin DIP sockets, instead of 4 28-pin DIP sockets.

                       CACHE TAG CHIP CONFIGURATION

    Size         JP3           JP4          JP5         U55        U56

    64KB         Open         Open          Open      (1) 8K x     N/A
                                                         8

   128KB        Closed        Open          Open      (1) 8K x     N/A
                                                         8

   256KB        Closed       Closed         Open      (1) 8K x    (1) 8K
                                                         8         x 8

   512KB        Closed       Closed        Closed      (1) 32K     N/A
                                                        x 8

                    CACHE DIRTY BIT CHIP CONFIGURATION

    Size         JP16           JP17           JP18          U72 & U54

    64KB         Open           Open           Open        (2) 16K x 1 or
                                                            (2) 64K x 1

   128KB        Closed          Open           Open        (2) 16K x 1 or
                                                            (2) 64K x 1

   256KB        Closed         Closed          Open        (2) 16K x 1 or
                                                            (2) 64K x 1

   512KB        Closed         Closed         Closed        (2) 64K x 1

                          CPU TYPE CONFIGURATION

          Type                     JP10                     JP11

         80486SX            pins 1 & 2 & 3 & 4       pins 2 & 3 closed
                                  closed

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

         80486DX            pins 2 & 3 closed               Open

   EBC SPEED CONFIGURATION

  Speed      JP6      JP7

  20MHz     Open      Open

  25MHz     Open      Open

  33MHz     Open     Closed

  40MHz     Closed    Open

  50MHz     Closed   Closed