TYAN COMPUTER CORPORATION

486 BABY EISA (REV. 2.0)


Processor         80486SX/80487SX/80486DX
Processor Speed   20/25/33/40/50MHz
Chip Set          OPTI
Max. Onboard DRAM 128MB
Cache             64/128/256/512KB
BIOS              AMI/Phoenix
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

  »   Snooping/flush select 20MHz              JP8            Closed

      Snooping/flush select                    JP8             Open
      25/33/40/50MHz

  »   Monitor type select color                JP9            Closed

      Monitor type select monochrome           JP9             Open

  »   CPU speed select iOSC/1                  JP12          pins 1 & 2
                                                              closed

      CPU speed select iOCS/2                  JP12          pins 2 & 3
                                                              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        (4) 32K x 8        NONE

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

     512KB        (4) 128K x 8       NONE

                         CACHE TAG CONFIGURATION

     Size        TAG (U54)      TAG (U55)      TAG (U56)      TAG (U72)

     64KB       (1) 64K x 1     (1) 8K x 8       NONE        (1) 64K x 1

     128KB      (1) 64K x 1     (1) 8K x 8       NONE        (1) 64K x 1

     256KB      (1) 64K x 1     (1) 8K x 8    (1) 8K x 8     (1) 64K x 1

     512KB      (1) 64K x 1    (1) 32K x 8       NONE        (1) 64K x 1

                        CACHE JUMPER CONFIGURATION

  Size    JP2      JP3      JP4       JP5      JP16      JP17      JP18

  64KB     2 &    Open      Open      Open     Open      Open      Open
           3

  128KB    1 &   Closed    Closed     Open    Closed     Open      Open
           2

  256KB    2 &   Closed    Closed     Open    Closed     Open     Closed
           3

  512KB    1 &   Closed    Closed    Closed   Closed    Closed    Closed
           2

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

       Type               JP1               JP10               JP11

      80486SX          pins 2 & 3        pins 2 & 3            Open
                        closed             closed

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

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

   CPU SPEED CONFIGURATION

  Speed      JP6      JP7

  20MHz     Open      Open

  25MHz     Open      Open

  33MHz     Open     Closed

  40MHz     Closed    Open

  50MHz     Closed   Closed