MULTI-TECH SYSTEMS, INC.

ISI502Q

Card Type          Serial controller
Chipset/Controller 16450/16550A
I/O Options        Serial ports (2)
Maximum DRAM       N/A

[Image]

                            CONNECTIONS

        Purpose          Location         Purpose          Location

  Serial port 1            CN1      Serial port 2            CN2

                      PRIMARY PORT I/O ADDRESS SELECT

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

  »   2F8h   Off     On      On      On      On     Off      On      Off

      3F8h   Off     On      On      On      On      On      On      Off

      3E8h   Off     Off     On      On      On      On      On      Off

      2E8h   Off     Off     On      On      On     Off      On      Off

                     SECONDARY PORT I/O ADDRESS SELECT

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

  »   2F0h   Off     On      On      On      On     Off      On      Off

      3F0h   Off     On      On      On      On      On      On      Off

      3E0h   Off     Off     On      On      On      On      On      Off

      2E0h   Off     Off     On      On      On     Off      On      Off

                   PRIMARY SERIAL PORT INTERRUPT SELECT

     IRQ          J2/A        J2/B        J2/C        J2/D        J2/E

  »    IRQ4       Open        Open       Closed       Open        Open

       IRQ3       Open       Closed       Open        Open        Open

       IRQ2      Closed       Open        Open        Open        Open

       IRQ5       Open        Open        Open       Closed       Open

       IRQ7       Open        Open        Open        Open       Closed

                  SECONDARY SERIAL PORT INTERRUPT SELECT

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

  »    IRQ5       Open        Open        Open       Closed       Open

       IRQ3       Open       Closed       Open        Open        Open

       IRQ4       Open        Open       Closed       Open        Open

       IRQ2      Closed       Open        Open        Open        Open

       IRQ7       Open        Open        Open        Open       Closed