
TYAN COMPUTER CORPORATION

486VL EISA VESA LOCAL BUS (REV. 1.0)

Processor         80486SX/80487SX/80486DX/80486DX2
Processor Speed   20/25/33/50 (Internal)/50/66 (Internal)MHz
Chip Set          SIS
Max. Onboard DRAM 256MB
Cache             64/128/256/512/1024KB
BIOS              AMI
Dimensions        330mm x 220mm
I/O Options       32-bit VESA local bus slots (2)
NPU Options       None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  Power LED & keylock        JP20       Turbo switch              JP23

  Speaker                    JP21       Turbo LED                 JP24

  Reset switch               JP22       32-bit VESA Local       S1 & S2
                                        bus slots

                        USER CONFIGURABLE SETTINGS

              Function                  Jumper/Switch         Position

     Factory configured - do not            JP18               Open
      alter

                            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) 1M x 9     (4) 4M 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       TAG (U15)       TAG (U16)

      64KB        (4) 8K x 8    (4) 8K x 8    (1) 8K x 8        NONE

     128KB        (4) 32K x 8    Bank 0       (1) 8K x 8        NONE

     256KB        (4) 32K x 8   (4) 32K x     (1) 8K x 8        NONE
                                    8

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

     1024KB       (8) 128K x      NONE       (1) 32K x 8     (1) 32K x 8
                      8

                        CACHE JUMPER CONFIGURATION

  Size      JP5     JP6      JP7     JP8   JP9   JP10   JP12   JP13   JP14

  64KB     Open     Open     Open    2 &   1 &   1 &    Open   2 &    1 &
                                      3     2     2             3      2

  128KB    Closed   Open     Open    2 &   1 &   1 &    Open   1 &    1 &
                                      3     2     2             2      2

  256KB    Closed  Closed    Open    2 &   2 &   1 &    Open   2 &    2 &
                                      3     3     2             3      3

  512KB    Closed  Closed   Closed   2 &   1 &   1 &    1 &    1 &    1 &
                                      3     2     2      2      2      2

  1024KB   Closed  Closed   Closed   1 &   1 &   2 &    2 &    2 &    2 &
                                      2     2     3      3      3      3

  Note:Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

          Type                      JP1                     JP2

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

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

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

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

         CPU SPEED CONFIGURATION

        Speed                JP16

        33MHz        pins 2 & 3 closed

       > 33MHz        pins 1 & 2 closed

