
TEXAS MICRO SYSTEMS, INC.

E486C

Processor      80486DX/80486DX2/80486DX4
Processor      25/33/50(internal)/50/66(internal)/100(internal)MHz
Speed
Chip Set       Unidentified
Video Chip Set None
Maximum        64MB
Onboard Memory
Maximum Video  None
Memory
Cache          256KB
BIOS           Unidentified
Dimensions     355mm x 304mm
I/O Options    Auxiliary bus slots (6), CPU slot, floppy drive interface,
               IDE interface, parallel port, PS/2 mouse port, serial ports
               (2)
NPU Options    None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  Serial port 2               J1       PS/2 mouse port             J5

  IDE interface               J2       Parallel port               J9

  Serial port 1               J3       IDE interface LED           JP4

  Floppy drive interface      J4

                        USER CONFIGURABLE SETTINGS

                Function                     Label          Position

     Factory configured - do not             JP6       Pins 1 & 2, 3 & 4
      alter                                                  closed

     Counter timing select free              JP9       Pins 2 & 3 closed
      running

      Counter timing select CPU               JP9       Pins 1 & 2 closed
      heartbeat (ADS)

     Factory configured - do not            JP11       Pins 2 & 3 closed
      alter

     Factory configured - do not            JP12       Pins 2 & 3 closed
      alter

     Factory configured - do not            JP14             Open
      alter

     PS/2 mouse IRQ 12 unbuffered           JP15       Pins 1 & 2 closed

      PS/2 mouse IRQ 12 buffered             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 270                 SW1/4             Off

      I/O address select 370                 SW1/4             On

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (1) 256K x        None           None           None
                    36

     2MB        (1) 256K x     (1) 256K x        None           None
                    36             36

     3MB        (1) 256K x     (1) 256K x     (1) 256K x        None
                    36             36             36

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

     4MB       (1) 1M x 36        None           None           None

     8MB       (1) 1M x 36    (1) 1M x 36        None           None

     10MB      (1) 1M x 36    (1) 1M x 36     (1) 256K x    (1) 256K x 36
                                                  36

     12MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36        None

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

     16MB      (1) 4M x 36        None           None           None

     32MB      (1) 4M x 36    (1) 4M x 36        None           None

     32MB      (1) 2M x 36    (1) 2M x 36    (1) 2M x 36     (1) 2M x 36

     48MB      (1) 4M x 36    (1) 4M x 36    (1) 4M x 36        None

     64MB      (1) 4M x 36    (1) 4M x 36    (1) 4M x 36     (1) 4M x 36

                        CACHE CONFIGURATION

  Note: 256KB cache is factory installed and is not configurable.

                  CPU SPEED SELECTION

           Speed                        JP5

           25MHz             Pins 5 & 6, 7 & 8 closed

           33MHz                 Pins 5 & 6 closed

           50iMHz            Pins 5 & 6, 7 & 8 closed

           50MHz             Pins 1 & 2, 5 & 6 closed

           66iMHz                Pins 5 & 6 closed

          100iMHz                Pins 5 & 6 closed

            CPU TYPE SELECTION

        Type                 JP17

       80486DX        Pins 2 & 3 closed

      80486DX2        Pins 2 & 3 closed

      80486DX4        Pins 1 & 2 closed

         CPU MULTIPLIER SELECTION

     Multiplier              JP18

         2x           Pins 1 & 2 closed

         3x           Pins 2 & 3 closed

                          SERIAL PORT 2 SELECTION

       Setting              JP1               JP2               JP3

         RS-232         Pins 2 & 3        Pins 2 & 3        Pins 2 & 3
                           closed           closed            closed

          RS-422         Pins 1 & 2        Pins 1 & 2        Pins 1 & 2
                           closed           closed            closed

          RS-485         Pins 1 & 2        Pins 1 & 2        Pins 1 & 2
                           closed           closed            closed

                  BUS CLOCK BUFFER SELECTION

       Setting               JP7                  JP16

     Unbuffered        Pins 1 & 2 closed   Pins 1 & 2 closed

      Buffered         Pins 2 & 3 closed   Pins 2 & 3 closed

[Image]

                                CONNECTIONS

  Purpose                  Location    Purpose                  Location

  DC power                   J20       Front keyboard             JP15
                                       connector

  DC power                   J21       CPU slot                   SL1

  Rear keyboard              JP14      Auxiliary bus slots      SL2  SL6
  connector

                        USER CONFIGURABLE SETTINGS

               Function                     Label           Position

     Slot 7 card type select EISA           JP1        Pins 2 & 3 closed

      Slot 7 card type select ISA            JP1        Pins 1 & 2 closed

     Slot 5 card type select EISA           JP2        Pins 2 & 3 closed

      Slot 5 card type select ISA            JP2        Pins 1 & 2 closed

     Slot 3 card type select EISA           JP3        Pins 2 & 3 closed

      Slot 3 card type select ISA            JP3        Pins 1 & 2 closed

     Slot 1 card type select EISA           JP4        Pins 2 & 3 closed

      Slot 1 card type select ISA            JP4        Pins 1 & 2 closed

     Slot 9 card type select EISA           JP5        Pins 2 & 3 closed

      Slot 9 card type select ISA            JP5        Pins 1 & 2 closed

     Slot 11 card type select EISA          JP6        Pins 2 & 3 closed

      Slot 11 card type select ISA           JP6        Pins 1 & 2 closed

     Slot 13 card type select EISA          JP7        Pins 2 & 3 closed

      Slot 13 card type select ISA           JP7        Pins 1 & 2 closed

     Slot 6 card type select EISA           JP8        Pins 2 & 3 closed

      Slot 6 card type select ISA            JP8        Pins 1 & 2 closed

     Slot 4 card type select EISA           JP9        Pins 2 & 3 closed

      Slot 4 card type select ISA            JP9        Pins 1 & 2 closed

     Slot 2 card type select EISA           JP10       Pins 2 & 3 closed

      Slot 2 card type select ISA            JP10       Pins 1 & 2 closed

     Slot 8 card type select EISA           JP11       Pins 2 & 3 closed

      Slot 8 card type select ISA            JP11       Pins 1 & 2 closed

     Slot 10 card type select EISA          JP12       Pins 2 & 3 closed

      Slot 10 card type select ISA           JP12       Pins 1 & 2 closed

     Slot 12 card type select EISA          JP13       Pins 2 & 3 closed

      Slot 12 card type select ISA           JP13       Pins 1 & 2 closed

  Note: Slot 1 is located at the top of the diagram.

