Computer Hardware
On a leased line installation a known good external modem shows no carrier detect light. Where is the problem most likely to be?

In the computer
None of these
In the DTC equipment
In the phone line
In the modem

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Computer Hardware
Whenever you have a hardware resource conflict, it will more likely be an IRQ conflict rather than an i/o conflict because:

software tends to correct I/O conflicts
the BIOS sometimes has more of a problem controlling IRQs
I/O addresses cannot conflict
software tends to mess up IRQs
there are a lot more I/O addresses than IRQs.

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