
ADVANCED MICROCOMPUTER SYSTEMS, INC.

422/485PC-20/DB25

Card Type               Serial card
Chip Set                Unidentified
Maximum Onboard Memory  N/A
I/O Options             Serial ports (2)
Data Bus                16-bit ISA
Floppy drives supported N/A

[Image]

                          CONNECTIONS

            Function                         Label

  37-pin serial port connector                CN1

                     SERIAL PORT ADDRESS CONFIGURATION

  Serial port 1      Serial      J7/A       J7/B       J7/C       J7/D
                     port 2

        COM1         COM2      Closed     Closed      Open       Open
        (3F8h)       (2F8h)

         COM2         COM3       Open      Closed     Closed      Open
        (2F8h)       (3E8h)

         COM3         COM4       Open       Open      Closed     Closed
        (3E8h)       (2E8h)

         COM1         N/A       Closed      Open       Open       Open
        (3F8h)

         COM2         N/A        Open      Closed      Open       Open
        (2F8h)

         COM3         N/A        Open       Open      Closed      Open
        (3E8h)

         COM4         N/A        Open       Open       Open      Closed
        (2E8h)

       Disabled       Open       Open       Open       Open       Open

                     SERIAL PORT 1 INTERRUPT SELECTION

    IRQ       SP1/A     SP1/B      SP1/C     SP1/D     SP1/E      SP1/F

      2/9    Closed      Open      Open       Open      Open       Open

       3      Open      Closed     Open       Open      Open       Open

      4      Open       Open     Closed      Open      Open       Open

       5      Open       Open      Open      Closed     Open       Open

       6      Open       Open      Open       Open     Closed      Open

       7      Open       Open      Open       Open      Open      Closed

       10     Open       Open      Open       Open      Open       Open

       11     Open       Open      Open       Open      Open       Open

       12     Open       Open      Open       Open      Open       Open

       14     Open       Open      Open       Open      Open       Open

       15     Open       Open      Open       Open      Open       Open

                 SERIAL PORT 1 INTERRUPT SELECTION (CONT)

     IRQ         SP1/G       SP1/H       SP1/I       SP1/J        SP1/K

       2/9       Open        Open         Open        Open        Open

        3        Open        Open         Open        Open        Open

       4        Open        Open         Open        Open        Open

        5        Open        Open         Open        Open        Open

        6        Open        Open         Open        Open        Open

        7        Open        Open         Open        Open        Open

        10      Closed       Open         Open        Open        Open

        11       Open       Closed        Open        Open        Open

        12       Open        Open        Closed       Open        Open

        14       Open        Open         Open       Closed       Open

        15       Open        Open         Open        Open       Closed

                     SERIAL PORT 2 INTERRUPT SELECTION

    IRQ       SP2/A     SP2/B      SP2/C     SP2/D     SP2/E      SP2/F

      2/9    Closed      Open      Open       Open      Open       Open

      3      Open      Closed     Open       Open      Open       Open

       4      Open       Open     Closed      Open      Open       Open

       5      Open       Open      Open      Closed     Open       Open

       6      Open       Open      Open       Open     Closed      Open

       7      Open       Open      Open       Open      Open      Closed

       10     Open       Open      Open       Open      Open       Open

       11     Open       Open      Open       Open      Open       Open

       12     Open       Open      Open       Open      Open       Open

       14     Open       Open      Open       Open      Open       Open

       15     Open       Open      Open       Open      Open       Open

                 SERIAL PORT 2 INTERRUPT SELECTION (CONT)

     IRQ         SP2/G       SP2/H       SP2/I       SP2/J        SP2/K

       2/9       Open        Open         Open        Open        Open

       3        Open        Open         Open        Open        Open

        4        Open        Open         Open        Open        Open

        5        Open        Open         Open        Open        Open

        6        Open        Open         Open        Open        Open

        7        Open        Open         Open        Open        Open

        10      Closed       Open         Open        Open        Open

        11       Open       Closed        Open        Open        Open

        12       Open        Open        Closed       Open        Open

        14       Open        Open         Open       Closed       Open

        15       Open        Open         Open        Open       Closed

                       MISCELLANEOUS TECHNICAL NOTE

            Note: CN1 is a DB-37 connector which has two DB-25 (port 1 &
            2) serial ports connected.

