### Before Configuring the Adapter

Use this information to prepare to manually configure the ISA adapter. During the setup process you will use the Digi-supplied DOS configuration utility, CFG.EXE, to configure the adapter before you install the driver. You must configure ClassicBoard ISA adapters to operate in legacy mode under Windows NT.

Note: ClassicBoard ISA adapters are set for Plug and Play operation by default. You can use CFG.EXE to switch them to legacy operation for manual installation and configuration under non-Plug and Play operating systems.

Before you configure the adapter, collect the following information:

- The serial communication chip on the adapter is either a 16554 Quad UART or a 16654 Quad UART. As part of the adapter configuration, you must identify which UART type your adapter uses.
- Be sure the following hardware resources are available on your system:
  - One free unused interrupt (IRQ) for each adapter
  - 8 bytes of I/O address space for each COM port present
  - 8 bytes of I/O address space to control the interrupt and the on board clock