I/O Ports and ConnectorsB-3
To avoid autoconfiguration, you may be able to reset jumpers on the expansion card
so that the cards port designation changes to the next available COM number, leaving
the designation for the built-in port as is. Alternatively, you can disable the built-in
ports through the System Setup program. The documentation for your expansion card
should provide the cards default I/O address and allowable IRQ settings. It should
also provide instructions for readdressing the port and changing the IRQ setting, if
necessary.
The built-in parallel port has autoconfiguration capability through the System Setup
program; that is, if you set the parallel port to its automatic configuration and add an
expansion card containing a port configured as LPT1 (IRQ7, I/O address 378h),
the system automatically remaps the built-in parallel port to its secondary address
(IRQ5, I/O address 278h). If the secondary port address is already being used, the
built-in parallel port is turned off.
For general information on how your operating system handles serial and parallel
ports, and for more detailed command procedures, see your operating system
documentation.
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If you reconfigure your hardware, you may need pin number and signal information for
the serial port connectors. Figure B-2 illustrates the pin numbers for the serial port
connectors, and Table B-1 lists and defines the pin assignments and interface signals
for the serial port connectors.

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