
TEXAS MICROSYSTEMS, INC.

PS486

Processor        80486SX/80486DX/80486DX2/80486DX4/P24D/P24T
Processor Speed  33/66(internal)/100(internal)MHz
Chip Set         Intel
Video Chip Set   None
Maximum Onboard  128MB
Memory
Maximum Video    None
Memory
Cache            128/256KB
BIOS             Phoenix
Dimensions       337mm x 122mm
I/O Options      AUI connector, floppy drive interface, IDE interface,
                 SCSI interface, parallel port, PS/2 mouse port, serial
                 ports (2)
NPU Options      None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  SCSI interface              CN1      PS/2 mouse port             CN7

  IDE interface               CN2      AUI connector               CN8

  Floppy drive interface      CN3      AT keyboard connector       CN9

  Parallel port               CN4      AUI receive LED             JP4

  Serial port 1               CN5      AUI active link LED         JP5

  Serial port 2               CN6      Hard drive LED              JP7

                        USER CONFIGURABLE SETTINGS

               Function                    Label           Position

     Parity select DPU generation          JP2        Pins 1 & 2 closed

      Parity select CPU generation          JP2        Pins 2 & 3 closed

     SCSI speed select 33MHz               JP8        Pins 2 & 3 closed

      SCSI speed select 40MHz               JP8        Pins 1 & 2 closed

     Watchdog timer enabled               JP16        Pins 2 & 3 closed

      Watchdog timer disabled              JP16        Pins 1 & 2 closed

     PS/2 IRQ 12 enabled                  JP17        Pins 1 & 2 closed

      Next Step OS used                    JP17        Pins 2 & 3 closed

     PCI bus speed select 33MHz           JP23        Pins 2 & 3 closed

      PCI bus speed select 25MHz           JP23        Pins 1 & 2 closed

     Factory configured - do not          JP27          Unidentified
      alter

     Monitor type select color            SW1/1              On

      Monitor type select monochrome       SW1/1              Off

     Flash BIOS enabled                   SW1/2              On

      Flash BIOS disabled                  SW1/2              Off

     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

                 CACHE CONFIGURATION

  Note: The location of the cache is unidentified.

  CACHE JUMPER CONFIGURATION

   Size      JP24      JP25

  128KB      Open      Open

  256KB     Closed    Closed

                            CPU TYPE SELECTION

      Type           JP1           JP14           JP15           JP18

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

    80846DX       Pins 2 & 3     Pins 2 & 3    Pins 2 & 3     Pins 2 & 3
                    closed        closed         closed         closed

    80486DX2      Pins 1 & 2     Pins 2 & 3    Pins 2 & 3     Pins 2 & 3
                    closed        closed         closed         closed

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

      P24D        Pins 2 & 3     Pins 1 & 2    Pins 1 & 2     Pins 2 & 3
                    closed        closed         closed         closed

      P24T        Pins 2 & 3     Pins 1 & 2    Pins 1 & 2     Pins 2 & 3
                    closed        closed         closed         closed

            CPU TYPE SELECTION

        Type                 JP22

   Non SL enhanced    Pins 1 & 2 closed

     SL enhanced      Pins 2 & 3 closed

                            CPU CACHE SELECTION

      CPU           Cache          JP6            JP12           JP19

    80486SX         WT/WT       Pins 5 & 6     Pins 2 & 3       Closed
                                  closed         closed

    80486SX         WT/WB       Pins 1 & 2     Pins 1 & 2        Open
                                  closed         closed

    80846DX         WT/WT       Pins 5 & 6     Pins 2 & 3       Closed
                                  closed         closed

    80846DX         WT/WB       Pins 1 & 2     Pins 1 & 2        Open
                                  closed         closed

    80486DX2        WT/WT       Pins 5 & 6     Pins 2 & 3       Closed
                                  closed         closed

    80486DX2        WT/WB       Pins 1 & 2     Pins 1 & 2        Open
                                  closed         closed

    80486DX4        WT/WB       Pins 5 & 6     Pins 2 & 3       Closed
                                  closed         closed

      P24D          WB/WT       Pins 5 & 6     Pins 1 & 2       Closed
                                  closed         closed

         CPU MULTIPLIER SELECTION

     Multiplier              JP13

         2x           Pins 2 & 3 closed

         3x           Pins 1 & 2 closed

                          SERIAL PORT 2 SELECTION

       Setting              JP9              JP10              JP11

         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

