Lenovo ThinkPad 560 Thinkpad 560 User's Guide - Page 225
For DOS or Windows, reserve COM2 for the PC Card, and, COM3 and COM4.
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Advanced Information for PC Cards If you are using Auto Configurator to enable your PC Card, you can change the resources assigned to the PC Card by using the Auto Configurator. Make sure the resource is not used by other devices and can be used by the PC Card and its application program. For more information, see "Starting the Auto Configurator Utility for OS/2 or Windows" on page 191. If you are using modem cards, some modem cards use serial port COM1 or COM2 and do not have the setup information for COM3 and COM4. These modem cards cannot be enabled when other devices are using COM1 and COM2. (For example, as a default, COM1 is used by the infrared device and COM2 is used by the Mwave modem.) Error messages are displayed to tell you that the I/O port address 3F8 or 2F8, or IRQ level 3 or 4, were not allocated. If this is the case, use the ThinkPad Setup Utility in the ThinkPad Features program to: - For OS/2, disable the devices using COM1 or COM2; then restart the system. - For DOS or Windows, reserve COM2 for the PC Card, and use COM1 for other integrated communication devices. Appendix B. Advanced Information for PC Cards 207