Specifications

Chapter 2 Hardware Installation 11
I/O Address and Interrupt Setup
Next, you will need to select an I/O base address, and port IRQ
(interrupt request) numbers for the PCL-846/847 .
Mode Setup (base address setting, S2)
The card base address can be set using the DIP switches on the card.
The DIP switch labelled "MODE 1" will set the card to standard or
enhanced mode, as shown below.
Standard Mode
In this mode, each of the four ports has a pre-assigned address, as
shown below.
Port 1 Ch1 base address 3F8
Port 2 Ch2 base address 2F8
Port 3 Ch3 base address 3E8
Port 4 Ch4 base address 2E8