
TEXAS MICROSYSTEMS, INC.

DS486

Processor           80486SX/80486DX/80486DX2/80486DX4
Processor Speed     33/66(internal)/100(internal)MHz
Chip Set            Intel
Video Chip Set      None
Maximum Onboard     128MB
Memory
Maximum Video MemoryNone
Cache               256KB
BIOS                Phoenix
Dimensions          337mm x 122mm
I/O Options         Floppy drive interface, IDE interface, SCSI interface,
                    parallel port, PS/2 mouse interface, serial ports (2),
                    PCI video module connector
NPU Options         None

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  SCSI interface            CN1        Serial port 1             CN6

  IDE interface             CN2        Parallel port             CN7

  PS/2 mouse &              CN3        PCI video module          CN8
  keyboard interface                   connector

  Floppy drive              CN4        AT keyboard               CN9
  interface                            connector

  Serial port 2             CN5        Hard drive LED            JP20

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     PCI bus speed select 33MHz            JP2        Pins 2 & 3 closed

      PCI bus speed select 25MHz            JP2        Pins 1 & 2 closed

     Factory configured - do not           JP4        Pins 1 & 2 closed
      alter

     Factory configured - do not          JP13        Pins 2 & 3 closed
      alter

     Factory configured - do not          JP14        Pins 2 & 3 closed
      alter

     Factory configured - do not          JP17          Unidentified
      alter

     Factory configured - do not          JP19          Unidentified
      alter

     SCSI speed select 33MHz              JP24        Pins 2 & 3 closed

      SCSI speed select 40MHz              JP24        Pins 1 & 2 closed

     Watchdog timer enabled               JP25        Pins 1 & 2 closed

      Watchdog timer disabled              JP25        Pins 2 & 3 closed

     PS/2 IRQ12 enabled                   JP26        Pins 1 & 2 closed

      Next Step OS used                    JP26        Pins 2 & 3 closed

     Monitor type select color            SW1/1              On

      Monitor type select monochrome       SW1/1              Off

     Flash BIOS enabled                   SW1/2              Off

      Flash BIOS disabled                  SW1/2              On

     CMOS memory normal operation         SW1/3              Off

      CMOS memory clear                    SW1/3              On

     Factory configured - do not          SW1/4         Unidentified
      alter

             DRAM CONFIGURATION

     Size          Bank 0        Bank 1

      8MB        (2) 1M x 36      None

     16MB        (2) 1M x 36   (2) 1M x 36

     24MB        (2) 2M x 36   (2) 1M x 36

     32MB        (2) 4M x 36      None

     40MB        (2) 4M x 36   (2) 1M x 36

     48MB        (2) 4M x 36   (2) 2M x 36

     64MB        (2) 8M x 36      None

     64MB        (2) 4M x 36   (2) 4M x 36

     96MB        (2) 8M x 36   (2) 4M x 36

     128MB       (2) 8M x 36   (2) 8M x 36

  Note: Board also accepts x 32 SIMMs.

                            CACHE CONFIGURATION

  Note: Bank 0 is factory installed and is not configurable. The location
  is unidentified.

                        CACHE JUMPER CONFIGURATION

      Size               JP8               JP9                JP16

      256KB           Pins 1 & 2        Pins 2 & 3      Pins 5 & 6 closed
                       closed             closed

                      CPU TYPE SELECTION

        Type                 JP3                  JP5

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

       80486DX         Pins 2 & 3 closed   Pins 2 & 3 closed

      80486DX2         Pins 2 & 3 closed   Pins 2 & 3 closed

      80486DX4         Pins 2 & 3 closed   Pins 1 & 2 closed

                 CPU MULTIPLIER SELECTION (80486DX4 ONLY)

              Multiplier                               JP1

                     2x                         Pins 1 & 2 closed

                    2.5x                        Pins 2 & 3 closed

                    3x                               Open

                          SERIAL PORT 2 SELECTION

       Setting             JP18              JP21              JP22

         RS232          Pins 2 & 3       Pins 2 & 3         Pins 2 & 3
                          closed            closed            closed

          RS422          Pins 1 & 2       Pins 1 & 2         Pins 1 & 2
                          closed            closed            closed

          RS485          Pins 1 & 2       Pins 1 & 2         Pins 1 & 2
                          closed            closed            closed

