
ROBOTECH, INC.

COBRA-RT VER. A

Processor   CX486S/80486SX/CX487S/80487SX/80486DX/ODP486SX/80486DX2/
            80486DX4/Pentium Overdrive
Processor   25/33/40/50(internal)/50/66(internal)MHz
Speed
Chip Set    SIS
Max. Onboard64MB
DRAM
Cache       32/64/128/256KB
BIOS        AMI
Dimensions  254mm x 220mm
I/O Options 32-bit VESA local bus slots (3)
NPU Options None

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose                 Location

  External battery            JP8       Reset switch             JP15D

  Speaker                    JP15A      Turbo switch             JP15E

  Power LED & keylock        JP15B      +5vDC ground             JP15F

  Turbo LED                  JP15C      32-bit VESA local      SL1 - SL3
                                        bus slots

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     CMOS memory normal operation             JP8           pins 2 & 3
                                                              closed

      CMOS memory clear                        JP8           pins 3 & 4
                                                              closed

     Power good signal detect from           JP11           pins 1 & 2
      power supply                                            closed

      Power good signal detect from           JP11           pins 2 & 3
      board                                                   closed

     CPU type select 1 CPU on board          JP12           pins 1 & 2
      (PQFP or PGA)                                           closed

      CPU type select 2 CPU on board          JP12           pins 2 & 3
      (PGA enabled PQFP disabled)                             closed

     Green PC mode enabled                   JP14           pins 2 & 3
                                                              closed

      Green PC mode disabled                  JP14           pins 1 & 2
                                                              closed

     VESA bus address type select            JP19           pins 1 & 2
      asynchronous (40/50mhz CPU)                             closed

      VESA bus address type select            JP19           pins 2 & 3
      synchronous                                             closed

     VESA bus data type select               JP20           pins 1 & 2
      synchronous                                             closed

      VESA bus data type select               JP20           pins 2 & 3
      asynchronous                                            closed

     VGA card select normal                  JP28           pins 1 & 2
                                                              closed

      VGA card select Weitek Power 9000       JP28           pins 2 & 3
      VGA only                                                closed

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

      1MB         (4) 256K x 9       NONE

      2MB         (4) 256K x 9   (4) 256K x 9

      4MB         (4) 1M x 9         NONE

      5MB         (4) 256K x 9    (4) 1M x 9

      8MB         (4) 1M x 9      (4) 1M x 9

      16MB        (4) 4M x 9         NONE

      17MB        (4) 4M x 9     (4) 256K x 9

      20MB        (4) 4M x 9      (4) 1M x 9

      32MB        (4) 4M x 9      (4) 4M x 9

      64MB        (4) 16M x 9        NONE

                    CACHE CONFIGURATION

     Size          Bank 0         Bank 1          TAG

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

     64KB        (4) 8K x 8     (4) 8K x 8    (1) 8K x 8

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

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 16K x 8

     256KB      (4) 32K x 8    (4) 32K x 8    (1) 32K x 8

                 CACHE JUMPER CONFIGURATION

   Size       JP5       JP6       JP7       JP9       JP10

   32KB      2 & 3     Open       Open      Open      Open

   64KB      1 & 2     Open       Open     Closed     Open

  128KB      2 & 3     2 & 3     Closed    Closed     Open

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

  256KB      1 & 2     1 & 2     Closed    Closed    1 & 2

  Note: Pins designated should be in the closed position.

                          CPU TYPE CONFIGURATION

            Type                     JP16                    JP17

           CX486S                    Open             pins 2 & 3 closed

          80486SX                    Open             pins 2 & 3 closed

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

          ODP486SX             pins 2 & 3 closed       pins 1 & 2, 3 & 4
                                                            closed

      80486DX/DX2/DX4          pins 1 & 2 closed       pins 1 & 2, 3 & 4
                                                            closed

     Pentium Overdrive         pins 1 & 2 closed       pins 1 & 2, 3 & 4
                                                            closed

             CPU SPEED CONFIGURATION

  Speed      JP21      JP22      JP23      JP27

  25MHz     Closed     Open     Closed     Open

  33MHz     Closed    Closed     Open      Open

  40MHz      Open      Open     Closed    Closed

  50iMHz    Closed     Open     Closed     Open

  50MHz      Open     Closed     Open     Closed

  66iMHz    Closed    Closed     Open      Open

                       VESA BUS CLOCK CONFIGURATION

       Setting          JP25 (SL2)        JP26 (SL1)        JP29 (SL3)

     Synchronous         pins 1 & 2        pins 1 & 2        pins 1 & 2
                          closed            closed            closed

    Asynchronous         pins 2 & 3        pins 2 & 3        pins 2 & 3
                          closed            closed            closed

       CIRRUS LOGIC VIDEO CARD CONFIGURATION (VER. AB)

      CPU speed              JP19                 JP20

        25MHz          pins 2 & 3 closed   pins 1 & 2 closed

        33MHz          pins 2 & 3 closed   pins 1 & 2 closed

        40MHz          pins 1 & 2 closed   pins 1 & 2 closed

       50iMHz          pins 2 & 3 closed   pins 1 & 2 closed

        50MHz          pins 1 & 2 closed   pins 1 & 2 closed

       66iMHz          pins 2 & 3 closed   pins 1 & 2 closed

       CIRRUS LOGIC VIDEO CARD CONFIGURATION (VER. AC)

      CPU speed              JP19                 JP20

        25MHz          pins 2 & 3 closed   pins 1 & 2 closed

        33MHz          pins 2 & 3 closed   pins 1 & 2 closed

        40MHz          pins 1 & 2 closed   pins 2 & 3 closed

       50iMHz          pins 2 & 3 closed   pins 1 & 2 closed

        50MHz          pins 1 & 2 closed   pins 2 & 3 closed

       66iMHz          pins 2 & 3 closed   pins 1 & 2 closed

