Computer Hardware
Which is LEAST likely to interfere with upgrading to a newer DOS Version?

Existing backup files
ROM BIOS
None of these
Compressed drives
Video controller

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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:

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

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