
TYAN COMPUTER CORPORATION

S1668 (REV. 1.2)

Processor                Pentium Pro
Processor Speed          150/166/180/200MHz
Chip Set                 Intel
Video Chip Set           None
Maximum Onboard Memory   1GB (EDO supported)
Maximum Video Memory     None
Cache                    256/512KB (located on Pentium Pro CPU)
BIOS                     AMI/Award
Dimensions               330mm x 218mm
I/O Options              32-bit PCI slots (5), floppy drive interface, IDE
                         interfaces (2), parallel port, PS/2 mouse port,
                         serial ports (2), IR connectors (2), VRM
                         connectors (2), USB connectors (2), soft on power
                         switch
NPU Options              None

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  Serial port 1              CN1       Turbo LED                  J42

  Parallel port              CN2       Speaker                    J43

  PS/2 mouse port            CN3       Power LED & keylock        J44

  Serial port 2              CN4       Reset switch               J45

  IDE interface 2            CN5       IDE interface LED          J46

  IDE interface 1            CN6       Turbo switch               J47

  Floppy drive interface     CN7       Chassis fan power          J49

  IR connector               CON4      Chassis fan power          J50

  IR connector               CON5      32-bit PCI slots         PC1 - PC5

  Soft on power switch        J1       VRM connector              VRM0

  USB connector 1            J18       VRM connector              VRM1

  USB connector 2            J25

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

      SMC I/O chip type select 665IR        J26        Pins 1 & 2 closed

      SMC I/O chip type select 669IR        J26        Pins 2 & 3 closed

     Factory configured - do not           J30          Unidentified
      alter

     Factory configured - do not           J31          Unidentified
      alter

     Flash BIOS voltage select 5v          J32        Pins 1 & 2 closed

      Flash BIOS voltage select 12v         J32        Pins 2 & 3 closed

     CMOS memory normal operation          J41              Open

      CMOS memory clear                     J41             Closed

     Factory configured - do not           J48          Unidentified
      alter

                            DRAM CONFIGURATION

     Size          Bank 0         Bank 1         Bank 2         Bank 3

      8MB        (2) 1M x 32       None           None           None

     16MB        (2) 2M x 32       None           None           None

     16MB        (2) 1M x 32   (2) 1M x 32        None           None

     32MB        (2) 2M x 32   (2) 2M x 32        None           None

     32MB        (2) 1M x 32   (2) 1M x 32    (2) 1M x 32    (2) 1M x 32

     32MB        (2) 4M x 32       None           None           None

     64MB        (2) 4M x 32   (2) 4M x 32        None           None

     64MB        (2) 8M x 32       None           None           None

     128MB       (2) 16M x 32      None           None           None

     128MB       (2) 4M x 32   (2) 4M x 32    (2) 4M x 32    (2) 4M x 32

     128MB       (2) 8M x 32   (2) 8M x 32        None           None

     192MB       (2) 8M x 32   (2) 8M x 32    (2) 8M x 32        None

     256MB       (2) 8M x 32   (2) 8M x 32    (2) 8M x 32    (2) 8M x 32

     256MB       (2) 16M x 32  (2) 16M x 32       None           None

     256MB       (2) 32M x 32      None           None           None

                        DRAM CONFIGURATION (CONT)

     Size          Bank 0         Bank 1         Bank 2         Bank 3

     384MB       (2) 16M x 32  (2) 16M x 32   (2) 16M x 32       None

     512MB       (2) 16M x 32  (2) 16M x 32   (2) 16M x 32   (2) 16M x 32

     512MB       (2) 32M x 32  (2) 32M x 32       None           None

     640MB       (2) 32M x 32  (2) 16M x 32   (2) 16M x 32   (2) 16M x 32

     768MB       (2) 32M x 32  (2) 32M x 32   (2) 32M x 32       None

     768MB       (2) 32M x 32  (2) 32M x 32   (2) 16M x 32   (2) 16M x 32

     832MB       (2) 32M x 32  (2) 32M x 32   (2) 32M x 32   (2) 8M x 32

     896MB       (2) 32M x 32  (2) 32M x 32   (2) 32M x 32   (2) 16M x 32

    1024MB       (2) 32M x 32  (2) 32M x 32   (2) 32M x 32   (2) 32M x 32

  Note: Board accepts EDO memory.

                              DRAM VOLTAGE SELECTION

  Voltage     J2       J3       J4       J5      J14      J15      J16      J17

      3.3v  Closed   Closed    Open     Open    Closed   Closed   Open     Open

     5v     Open     Open    Closed   Closed   Open     Open     Closed   Closed

                      CACHE CONFIGURATION

  Note: 256KB/512KB cache is located on the Pentium Pro CPU.

                            CPU SPEED SELECTION

    CPU      J11      J12       J21       J22      J23       J24     J27
  speed

  150MHz    Closed    Open      Open     Closed   Closed    Closed    3 &
                                                                      4

  166MHz    Open     Closed     Open     Closed   Closed    Closed    1 &
                                                                      2

  180MHz    Closed    Open     Closed    Open     Closed    Closed    3 &
                                                                      4

  200MHz    Open     Closed    Closed    Open     Closed    Closed    1 &
                                                                      2

  Note: Pins designated should be in the closed position.

                           CPU VOLTAGE SELECTION

           Voltage                     J10                    J20

           Auto select                Open                  Open

               2.1v                   1 & 5                  1 & 5

               2.2v                   2 & 6                  2 & 6

               2.3v                1 & 5, 2 & 6          1 & 5, 2 & 6

               2.4v                   3 & 7                  3 & 7

               2.5v                1 & 5, 3 & 7          1 & 5, 3 & 7

               2.6v                2 & 6, 3 & 7          2 & 6, 3 & 7

               2.7v             1 & 5, 2 & 6, 3 & 7   1 & 5, 2 & 6, 3 & 7

               2.8v                   4 & 8                  4 & 8

               2.9v                1 & 5, 4 & 8          1 & 5, 4 & 8

               3.0v                2 & 6, 4 & 8          2 & 6, 4 & 8

               3.1v             1 & 5, 2 & 6, 4 & 8   1 & 5, 2 & 6, 4 & 8

               3.2v                3 & 7, 4 & 8          3 & 7, 4 & 8

               3.3v             1 & 5, 3 & 7, 4 & 8   1 & 5, 3 & 7, 4 & 8

               3.4v             2 & 6, 3 & 7, 4 & 8   2 & 6, 3 & 7, 4 & 8

               3.5v              1 & 5, 2 & 6, 3 &     1 & 5, 2 & 6, 3 &
                                     7, 4 & 8              7, 4 & 8

  Note: Pins designated should be in the closed position.

                           SERIAL PORT SELECTION

           Setting                     J28                    J29

       Used and COM 1 or 2     Pins 1 & 2 closed      Pins 1 & 2 closed

       Used as IR connector     Pins 2 & 3 closed      Pins 2 & 3 closed

