Computer Hardware
On a dot matrix printer, you should never lubricate which part?

carriage rails
None of these
printhead pins
carriage bearings
paper advance bearings

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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:

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

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