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8. I/O Device Hacks > 76. Break the Rules with LPT Ports

Break the Rules with LPT Ports

Get back the use of IRQ lines by changing your LPT port settings.

Even though none of the early standard LPT port implementations ever used an IRQ line, Windows still insists that IRQ 7 or 5 is assigned to an LPT port (Windows performs no actual test for this—it’s a programmed assumption), so any other use of these IRQ lines causes Windows to erroneously flag such use as a conflict. Some of us are finicky about conflicts, and some programs may not accept port connections if a conflict exists.

Trying to use the same IRQ as the parallel port is a potential conflict only if both of these are true:

  • The LPT port is configured for Enhanced Parallel Port or Extended Capabilities Port (commonly used modes for pre-USB printers and scanners).


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