
DD & TT ENTERPRISE USA COMPANY

DT ESCORT SYSTEM BOARD A

Processor               80386SX/80486SLC
Processor Speed         25/33/40MHz
Chip Set                Symphony
Max. Onboard DRAM       16MB
Cache                   None
BIOS                    AMI
Dimensions              330mm x 218mm
I/O Options             Floppy drive interface, IDE interface, parallel
                        port

                        Proprietary EISA riser card slot, PS/2 mouse port

                        Serial port (2), VGA port, video feature connector
NPU Options             80387SX/CX487SLC

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                  Location

  PS/2 mouse port            J2        Reset switch               J12A

  Serial port (COM 1)        J3        Turbo switch               J12B

  Serial port (COM 2)        J4        Turbo LED                  J12C

  Parallel port              J5        IDE interface LED          J12D

  VGA port                   J6        Not used                   J12E

  Floppy drive               J9        Speaker                    J13A
  interface

  Video feature port         J10       Power LED & keylock        J13B

  IDE interface              J11       Proprietary riser           S1
                                       card slot

                        USER CONFIGURABLE SETTINGS

              Function                   Jumper            Position

     Floppy drive disabled                E1          pins 1 & 3 closed

      Floppy drive enabled                 E1          pins 3 & 5 closed

      Floppy drive address select          E1          pins 7 & 9 closed
      3FO-3F7

      Floppy drive address select          E1         pins 9 & 11 closed
      370-377

     IDE interface disabled               E1          pins 2 & 4 closed

      IDE interface enabled                E1          pins 4 & 6 closed

      IDE interface address                E1         pins 8 & 10 closed
      3FO-3F7, 1FO-1F7

      IDE interface address                E1         pins 20 & 12 closed
      370-377, 170-177

     On board video enabled               E2          pins 1 & 2, 3 & 4,
                                                         5 & 6 closed

      On board video disabled              E2          pins 1 & 2, 3 & 4,
                                                          5 & 6 open

     BIOS device select 1MB               E6          pins 1 & 2 closed

      BIOS device select 2MB               E6          pins 3 & 5 closed

      BIOS device select read only         E6          pins 2 & 4, 7 & 9,
                                                         8 & 10 closed

     BIOS device select read/write        E6         pins 4 & 6, 9 & 11,
                                                            10 & 12

     Chipset mode select 2x for           E7          pins 3 & 5 closed
      40MHz or less

      Chipset mode select 1x for           E7          pins 1 & 3 closed
      true 50MHz only

      Chipset mode RDY1 set for 1X         E7          pins 4 & 6 closed
      mode

      Chipset mode RDY2 set for 2X         E7          pins 2 & 4 closed
      mode

     Chipset mode burst rate              E8         pins 23 & 24 closed
      select 3-2-2-2

      Chipset mode burst rate              E8          pins 23 & 24 open
      select 2-1-1-1

     Chipset mode write select 0          E8         pins 25 & 26 closed
      wait state

      Chipset mode write select 1          E8          pins 25 & 26 open
      wait state

     PS/2 mouse enable at IRQ12           E10              Closed

      PS/2 mouse disable                   E10               Open

     CMOS memory normal                   E11               Open

      CMOS memory clear                    E11              Closed

     CPU speed select iOSC/2              E12         pins 2 & 3 closed

      CPU speed select iOSC/1              E12         pins 1 & 2 closed

     Factory configured - do not          E15         pins 1 & 2 closed
      alter

     Factory configured - do not      E16/1, 3 & 5    pins 3 & 5 closed
      alter

     Factory configured - do not      E16/2, 4, &     pins 4 & 6 closed
      alter                                 6

     Factory configured - do not       E16/7, 9 &    pins 9 & 11 closed
      alter                                11

     Factory configured - do not       E16/7 & 8           Closed
      alter

     Factory configured - do not      E16/8 & 10             N/A
      alter

     Factory configured - do not      E16/11 & 12           Open
      alter

                  USER CONFIGURABLE SETTINGS (CONTINUED)

              Function                   Jumper            Position

     Factory configured - do not      E16/13 & 14          Closed
      alter

     Factory configured - do not      E16/15 & 16          Closed
      alter

     Factory configured - do not      E16/17 & 18          Closed
      alter

  Note: If there is no monochrome Hercules card present then the system
  will automatically assume that address 378h is LPT1 and address 278h is
  LPT2.

  Pins designated should be in the closed position.

              DRAM CONFIGURATION

      Size          Bank 0          Bank 1

     512KB        (2) 256K x 9       NONE

      1MB         (2) 256K x 9   (2) 256K x 9

      2MB         (2) 1M x 9         NONE

     2.5MB        (2) 256K x 9    (2) 1M x 9

      4MB         (2) 1M x 9      (2) 1M x 9

      8MB         (2) 4M x 9         NONE

     8.5MB        (2) 256K x 9    (2) 4M x 9

      10MB        (2) 1M x 9      (2) 4M x 9

      16MB        (2) 4M x 9      (2) 4M x 9

      16MB        (2) 16M x 9    (2) 16M x 9

                        CPU SPEED CONFIGURATION

      Speed        E14/pins 1 & 2    E14/pins 3 & 4    E14/pins 5 & 6

      25MHz             Open             Closed            Closed

      33MHz             Open             Closed             Open

      40MHz             Open              Open             Closed

      25MHz             Open             Closed            Closed

      33MHz             Open             Closed             Open

                     SERIAL PORT A (J3) CONFIGURATION

             COM                    I/O Address                E5

              COM1                     3F8h             pins 3 & 5, 2 &
                                                            4, 7 & 8

               COM3                     3E8h             pins 1 & 3, 4 &
                                                            6, 7 & 8

               COM4                     2E8h             pins 3 & 5, 4 &
                                                            6, 7 & 8

             Disabled                   N/A             pins 1 & 3, 2 & 4

  Note: pins designated should be in the closed position.

                     SERIAL PORT B (J4) CONFIGURATION

             COM                    I/O Address                E4

              COM2                     2F8h             pins 3 & 5, 2 &
                                                            4, 7 & 8

               COM3                     3E8h             pins 3 & 5, 4 &
                                                            6, 7 & 8

               COM4                     2E8h             pins 1 & 3, 4 &
                                                            6, 7 & 8

             Disabled                   N/A             pins 1 & 3, 2 & 4

  Note:pins designated should be in the closed position.

                     PARALLEL PORT (J5) CONFIGURATION

          COM                 IRQ          I/O Address           E3

           LPT1             IRQ7              3BCh         pins 3 & 5, 4
                                                             & 6, 7 & 8

            LPT1             IRQ5              3BCh         pins 3 & 5, 4
                                                             & 6, 9 & 10

            LPT2             IRQ7              378h         pins 3 & 5, 2
                                                             & 6, 7 & 8

            LPT2             IRQ5              378h         pins 3 & 5, 2
                                                             & 6, 9 & 10

            LPT3             IRQ7              278h         pins 1 & 3, 4
                                                             & 6, 7 & 8

            LPT3             IRQ5              278h         pins 1 & 3, 4
                                                             & 6, 9 & 10

          Disabled            N/A              N/A          pins 1 & 3, 2
                                                                 & 4

  Note: pins designated should be in the closed position.

               VIDEO MEMORY CONFIGURATION

       Size              Bank 0             Bank 1

       512KB           (4) 44256             NONE

      1024KB           (4) 44256          (4) 44256

  Note: Bank 0 is permanently soldered onto the board.

