
TYAN COMPUTER CORPORATION

S1437

Processor         80486SX/80487SX/80486DX
Processor Speed   20/25/33/50MHz
Chip Set          OPTI
Max. Onboard DRAM 256MB
Cache             64/128/256/512KB
BIOS              AMI/Phoenix
Dimensions        309mm x 331mm
I/O Options       None
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                   Location    Purpose                  Location

  Speaker                      J4       Turbo LED                  J6

  Power LED & Keylock          J5       Reset switch               S9

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     External BCLK buffering 486DX           JP1            pins 1 & 2
      (33/50MHz)                                              closed

      External BCLK buffering 486SX           JP1            pins 2 & 3
      (20/25MHz) / 487SX                                      closed

     Snooping/Flush 20MHz CPU                JP8             closed

      Snooping/Flush 25/33/40/50 MHz          JP8              open
      CPU

     Monitor type select monochrome          JP9              open

      Monitor type select color               JP9             closed

     CPU speed select OSC/1                  JP12           pins 1 & 2
                                                              closed

      CPU speed select OSC/2                  JP12           pins 2 & 3
                                                              closed

     RTC/CMOS type select                JP13, JP14 &       pins 1 & 2
      DS1287/1287A                            JP15            closed

      RTC/CMOS type select DS1387/1488    JP13, JP14 &       pins 2 & 3
                                              JP15            closed

                           DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2        Bank 3

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

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

     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

     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

     28MB       (4) 1M x 9     (4) 1M x 9     (4) 4M x 9    (4) 1M x 9

     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

     52MB       (4) 1M x 9     (4) 4M x 9     (4) 4M x 9    (4) 4M x 9

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

     64MB       (4) 16M x 9       NONE           NONE          NONE

    128MB       (4) 16M x 9   (4) 16M x 9        NONE          NONE

    192MB       (4) 16M x 9   (4) 16M x 9    (4) 16M x 9       NONE

    256MB       (4) 16M x 9   (4) 16M x 9    (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        U54        U55       U56        U71      U72 (Dirty bit)

    64KB       (1) 64K    (1) 8K     NONE     (1) 64K     (1) 16K x 1 or
                x 1        x 1                  x 1        (1) 64K x 1

   128KB       (1) 64K    (1) 8K     NONE     (1) 64K     (1) 16K x 1 or
                x 1        x 1                  x 1        (1) 64K x 1

   256KB       (1) 64K    (1) 8K    (1) 8K    (1) 64K     (1) 16K x 1 or
                x 1        x 1       x 1        x 1        (1) 64K x 1

   512KB       (1) 64K   (1) 32K     NONE     (1) 64K      (1) 64K x 1
                x 1        x 1                  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     Open      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                    J10                       J11

        80486SX            pins 2 & 3 closed               open

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

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

   EBC SPEED CONFIGURATION

   Size      JP6      JP7

  20MHz     Open      Open

  25MHz     Open      Open

  33MHz     Open     Closed

  40MHz     Closed    Open

  50MHz     Closed   Closed

