
STB SYSTEMS, INC.

DSP 550

Card Type              Multi I/O Card
Chip Set               Unidentified
Maximum Onboard Memory N/A
I/O Options            Parallel port, serial ports (2)
Data Bus               8-bit ISA

[Image]

                                CONNECTIONS

          Function             Label           Function             Label

  Serial port 1                CN1     Parallel port                CN3

  Serial port 2                CN2

                        USER CONFIGURABLE SETTINGS

                  Function                      Label        Position

     Ring indicator signal supplied to          W1          Pins 1 & 2
      serial port 1                                           closed

      +5 volt signal supplied to serial          W1          Pins 3 & 4
      port 1                                                  closed

     Ring indicator signal supplied to          W2          Pins 1 & 2
      serial port 2                                           closed

      +5 volt signal supplied to serial          W2          Pins 3 & 4
      port 2                                                  closed

            Note: Jumpers W1 and W2 are used for ensuring compatibility
            with specialty serial devices and older mouse systems.

               PARALLEL PORT ADDRESS SELECTION

       Setting               J11                  J12

        278h           Pins 1 & 2 closed   Pins 2 & 3 closed

        378h           Pins 1 & 2 closed   Pins 1 & 2 closed

      Disabled         Pins 2 & 3 closed   Pins 2 & 3 closed

                      SERIAL PORT 1 ADDRESS SELECTION

           Setting                     J7                     J8

              2F8h             Pins 2 & 3 closed      Pins 1 & 2 closed

              3E8h             Pins 1 & 2 closed      Pins 2 & 3 closed

             3F8h             Pins 1 & 2 closed      Pins 1 & 2 closed

            Disabled           Pins 2 & 3 closed      Pins 2 & 3 closed

                      SERIAL PORT 2 ADDRESS SELECTION

           Setting                     J9                    J10

              2E8h             Pins 1 & 2 closed      Pins 2 & 3 closed

             2F8h             Pins 1 & 2 closed      Pins 1 & 2 closed

              3E8h             Pins 2 & 3 closed      Pins 1 & 2 closed

            Disabled           Pins 2 & 3 closed      Pins 2 & 3 closed

                     SERIAL PORT 1 INTERRUPT SELECTION

           IRQ                       J2                      J3

             IRQ2                   Open              Pins 1 & 2 closed

             IRQ3            Pins 1 & 2 closed              Open

            IRQ4            Pins 2 & 3 closed              Open

             IRQ5                   Open              Pins 2 & 3 closed

                     SERIAL PORT 2 INTERRUPT SELECTION

           IRQ                       J4                      J5

             IRQ2                   Open              Pins 1 & 2 closed

            IRQ3            Pins 1 & 2 closed              Open

             IRQ4            Pins 2 & 3 closed              Open

             IRQ5                   Open              Pins 2 & 3 closed

                     PARALLEL PORT INTERRUPT SELECTION

               IRQ                                   J1

                IRQ7                        Pins 1 & 2 closed

                 IRQ5                        Pins 2 & 3 closed

                PARALLEL PORT MODE SELECTION

          Setting                          J6

      Uni-directional                Pins 2 & 3 open

  Bi-Directional (EPP/ECP)          Pins 2 & 3 closed

