TEXAS MICROSYSTEMS, INC.

LS486/L486

Processor            80486SX/80487SX/80486DX/80486DX2
Processor Speed      33/50(internal)/66(internal)MHz
Chip Set             Unidentified
Video Chip Set       None
Maximum Onboard      32MB
Memory
Maximum Video Memory None
Cache                None
BIOS                 Unidentified
Dimensions           Unidentified
I/O Options          Floppy drive interface, IDE interface, SCSI interface,
                     parallel port, serial ports (2), video board connector
NPU Options          None

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                 Location

  SCSI interface             J1        Auxiliary keyboard         J7
                                       connector

  IDE interface              J2        External battery           JP4

  Floppy drive               J3        Hard drive LED             JP5
  interface

  Serial port 2              J4        Video board                JP9
                                       connector

  Serial port 1              J5        Texas Micro               JP11
                                       keyboard connector

  Parallel port              J6        Video board               JP13
                                       connector

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

  »   Battery type select internal            JP4           Pins 1 & 2
                                                              closed

      Battery type select external            JP4             Closed

  »   Watchdog timer disabled                 JP12          Pins 2 & 3
                                                              closed

      Watchdog timer enabled                  JP12          Pins 1 & 2
                                                              closed

      On board SCSI enabled                   JP15          Pins 1 & 2
                                                              closed

      On board SCSI disabled                  JP15          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

  »   I/O address select 270H                SW1/4             Off

      I/O address select 370H                SW1/4              On

                DRAM CONFIGURATION

      Size            Bank 0           Bank 1

       1MB        (1) 256K x 36         None

       2MB        (1) 256K x 36    (1) 256K x 36

       4MB         (1) 1M x 36          None

       5MB         (1) 1M x 36     (1) 256K x 36

       8MB         (1) 1M x 36      (1) 1M x 36

      16MB         (1) 4M x 36          None

      17MB         (1) 4M x 36     (1) 256K x 36

      20MB         (1) 4M x 36      (1) 1M x 36

      32MB         (1) 4M x 36      (1) 4M x 36

                            CPU TYPE SELECTION

       Type               JP1                JP2               JP3

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

      80487SX          Pins 1 & 2         Pins 1 & 2        Pins 1 & 2
                         closed            closed             closed

      80486DX          Pins 1 & 2         Pins 2 & 3        Pins 1 & 2
                         closed            closed             closed

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

    CPU TYPE SELECTION (80486SX ONLY)

     Multiplier              JP10

        PQFP          Pins 2 & 3 closed

         PGA          Pins 1 & 2 closed

                          SERIAL PORT 2 SELECTION

       Setting              JP6              JP7                JP8

  »       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

                         WATCHDOG TIMER SELECTION

                 Timer                                 JP14

  »              1.2 seconds                     Pins 1 & 2 closed

                    150ms                        Pins 2 & 3 closed

                    600ms                              Open