
MULTITECH SYSTEMS, INC.

ISI508U

Card Type          Serial card
Chipset Controller N/A
I/O Options        Serial ports (8 on external panel)
Maximum DRAM       N/A

[Image]

                          CONNECTIONS

            Purpose                        Location

  78-pin serial port connector                CN1

                        I/O BASE ADDRESS SELECTION

  Address   SW1/1   SW1/2   SW1/3   SW1/4   SW1/5   SW1/6   SW1/7   SW1/8

     380h   On      On      On      On     Off     Off     Off      On

      100h   On      On      On      On      On     Off      On      On

      108h   Off     On      On      On      On     Off      On      On

      110h   On      Off     On      On      On     Off      On      On

      118h   Off     Off     On      On      On     Off      On      On

      120h   On      On      Off     On      On     Off      On      On

      3D8h   Off     Off     On      Off    Off     Off     Off      On

      3E0h   On      On      Off     Off    Off     Off     Off      On

      3E8h   Off     On      Off     Off    Off     Off     Off      On

      3F0h   On      Off     Off     Off    Off     Off     Off      On

      3F8h   Off     Off     Off     Off    Off     Off     Off      On

       Note:A total of 96 base address settings are available. The
       switches are a binary representation of the decimal memory
       addresses. Switch SW1/8 is the Most Significant Bit and switch
       SW1/1 is the Least Significant Bit. The switches have the
       following decimal values: switch SW1/1=8, SW1/2=16, SW1/3=32,
       SW1/4=64, SW1/5=128, SW1/6=256, SW1/7=512, SW1/8=1024. Turn off
       the switches and add the values of the switches that are off to
       obtain the correct memory address. (Off=1, On=0)

                            INTERRUPT SELECTION

    IRQ       J1/A       J1/B      J1/C       J1/D      J1/E       J1/F

      3      Open      Closed     Open       Open      Open       Open

      2/9    Closed      Open      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

