DECISION COMPUTER INTERNATIONAL CO., LTD.

PCCOM 8-BIT ISA 4-PORT RS-422 (OLD)

Card Type   Serial
Chipset     National Semiconductor
I/O Options Serial ports (4)
Data Bus    8-bit ISA

[Image]

                                CONNECTIONS

         Function            Label            Function             Label

  Serial ports via 40 pin     CN1     Serial ports via DB-37        CN2
  header                              connector

            Note:Standard DB-25 serial ports are provided on included
            adapter cables.

                        USER CONFIGURABLE SETTINGS

                 Setting                    Label          Position

  »   Factory configured - do not alter       J1         Unidentified

  »   Bus speed set to 16MHz or lower        JP2       Pins 1 & 3 closed

      Bus speed set higher than 16MHz        JP2       Pins 2 & 4 closed

  »   Factory configured - do not alter     SW1/6        Unidentified

  »   Factory configured - do not alter     SW1/7             Off

  »   Factory configured - do not alter     SW1/8        Unidentified

                             OPERATING SYSTEM

      Setting          SW1/3        SW1/4         SW1/5          U24

  »    XENIX mode       Off          Off           On         XENIX PROM

       MS-DOS mode      On            On           Off       MS-DOS PROM

                       SERIAL PORT ADDRESSES (XENIX)

      Port 1           Port 2      Port 3    Port 4     SW1/1     SW1/2

          3F8h          2F8h        2B0h      2B8h       On         On
        (COM1:)       (COM2:)

          3F8h          2F8h        1B0h      1B8h       On        Off
        (COM1:)       (COM2:)

  »      2A0h           2A8h        2B0h      2B8h       Off        On

         1A0h           1A8h        1B0h      1B8h       Off       Off

                      SERIAL PORT ADDRESSES (MS-DOS)

    Port 1       Port 2        Port 3       Port 4      SW1/1     SW1/2

     3F8h          2F8h         3E8h          2E8h        On        On
   (COM1:)       (COM2:)      (COM3:)       (COM4:)

     280h         288h          290h         298h         On       Off

     2F8h          3E8h         2E8h         280h        Off        On
   (COM2:)       (COM3:)      (COM4:)

     3E8h          2E8h         280h         288h        Off       Off
   (COM3:)       (COM4:)

                             INTERRUPT (XENIX)

   Setting      JP4/A     JP4/B     JP4/C     JP4/D     JP4/E      JP4/F

       IRQ2     Pins 1    Open      Open       Open      Open      Open
                 & 2

       IRQ3     Open      Pins 1    Open       Open      Open      Open
                           & 2

       IRQ4     Open      Open      Pins 1     Open      Open      Open
                                     & 2

  »    IRQ5     Open      Open      Open      Pins 1     Open      Open
                                               & 2

       IRQ6     Open      Open      Open       Open     Pins 1     Open
                                                         & 2

       IRQ7     Open      Open      Open       Open      Open      Pins 1
                                                                    & 2

            Note:Pins designated in closed position.

                         PORT 1 INTERRUPT (MS-DOS)

  Setting      JP3/A     JP3/B     JP3/C     JP3/D      JP3/E     JP3/F

    IRQ2       Pins 2    Open       Open      Open      Open       Open
                & 3

    IRQ3       Open      Pins 2     Open      Open      Open       Open
                          & 3

    IRQ4       Open      Open      Pins 2     Open      Open       Open
                                    & 3

    IRQ5       Open      Open       Open     Pins 2     Open       Open
                                              & 3

    IRQ6       Open      Open       Open      Open      Pins 2     Open
                                                         & 3

    IRQ7       Open      Open       Open      Open      Open     Pins 2 &
                                                                    3

            Note:Pins designated are in the closed position.

                         PORT 2 INTERRUPT (MS-DOS)

  Setting      JP3/A     JP3/B     JP3/C     JP3/D      JP3/E     JP3/F

    IRQ2       Pins 1    Open       Open      Open      Open       Open
                & 2

    IRQ3       Open      Pins 1     Open      Open      Open       Open
                          & 2

    IRQ4       Open      Open      Pins 1     Open      Open       Open
                                    & 2

    IRQ5       Open      Open       Open     Pins 1     Open       Open
                                              & 2

    IRQ6       Open      Open       Open      Open      Pins 1     Open
                                                         & 2

    IRQ7       Open      Open       Open      Open      Open     Pins 1 &
                                                                    2

            Note:Pins designated are in the closed position.

                         PORT 3 INTERRUPT (MS-DOS)

  Setting      JP4/A     JP4/B     JP4/C     JP4/D      JP4/E     JP4/F

    IRQ2       Pins 2    Open       Open      Open      Open       Open
                & 3

    IRQ3       Open      Pins 2     Open      Open      Open       Open
                          & 3

    IRQ4       Open      Open      Pins 2     Open      Open       Open
                                    & 3

    IRQ5       Open      Open       Open     Pins 2     Open       Open
                                              & 3

    IRQ6       Open      Open       Open      Open      Pins 2     Open
                                                         & 3

    IRQ7       Open      Open       Open      Open      Open     Pins 2 &
                                                                    3

            Note:Pins designated are in the closed position.

                         PORT 4 INTERRUPT (MS-DOS)

  Setting      JP4/A     JP4/B     JP4/C     JP4/D      JP4/E     JP4/F

    IRQ2       Pins 1    Open       Open      Open      Open       Open
                & 2

    IRQ3       Open      Pins 1     Open      Open      Open       Open
                          & 2

    IRQ4       Open      Open      Pins 1     Open      Open       Open
                                    & 2

    IRQ5       Open      Open       Open     Pins 1     Open       Open
                                              & 2

    IRQ6       Open      Open       Open      Open      Pins 1     Open
                                                         & 2

    IRQ7       Open      Open       Open      Open      Open     Pins 1 &
                                                                    2

            Note:Pins designated are in the closed position.

                   DIAGNOSTIC LED(S)

            The function of the LED is unidentified.