US Robotics 3Com Manual de usuario Pagina 34

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TROUBLESHOOTING AND HELP RESOURCES
6-13
IRQ Assignment
0 System Timer
1 Keyboard
2 Cascade input (mandatory function)
3 COM2
4 COM1
5 Sound/Parallel Port 2 (LPT2)
6 Disk Controller (All internal floppy drives)
7 Parallel Port 1 (LPT1)
8 Real-time clock interrupt
9 Reserved
10 Reserved
11 Reserved
As you can see above, there are no default assignments for COM3 and COM4. In order
to use COM3 or COM4, you must assign it to an IRQ. This means sharing that IRQ with
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