BOCA RESEARCH, INC.

IOAT55

Card Type          Multi I/O card
Chipset/Controller 16C550
I/O Options        Parallel port, serial ports (2)
Maximum DRAM       N/A

[Image]

                            CONNECTIONS

        Purpose          Location         Purpose          Location

  Serial port 1            CN1      Serial port 2            CN3

  Parallel port            CN2

                         SERIAL PORT CONFIGURATION

   Port 1 (CN1)            J5            Port 2 (CN3)          J5

  »      COM1          Pins 13 & 14         COM2        Pins 2 & 3 closed
                         closed

         COM2          Pins 14 & 15         COM1        Pins 1 & 2 closed
                         closed

         COM3          Pins 16 & 17         COM3        Pins 4 & 5 closed
                         closed

         COM4          Pins 17 & 18         COM4        Pins 5 & 6 closed
                         closed

                       SERIAL PORT INTERRUPT SELECT

   Port 1 (CN1)            J5            Port 2 (CN3)          J5

  »      IRQ4          Pins 22 & 23         IRQ3           Pins 11 & 12
                         closed                              closed

         IRQ3          Pins 23 & 24         IRQ4           Pins 10 & 11
                         closed                              closed

         IRQ5          Pins 20 & 21         IRQ5        Pins 8 & 9 closed
                         closed

         IRQ7          Pins 19 & 20         IRQ7        Pins 7 & 8 closed
                         closed

                                     PARALLEL PORT CONFIGURATION

                        LPT                                                 J4

  »                        1                                        Pins 1 & 2 closed

                           2                                        Pins 2 & 3 closed

                      PARALLEL PORT INTERRUPT SELECT

                  IRQ                                  J4

  »                 IRQ7                        Pins 4 & 5 closed

                    IRQ5                        Pins 5 & 6 closed