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Whats the difference between the “hard” and “soft” port I/O access modes?

April 26, 2017difference hard modes o port soft

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Whats the difference between the “hard” and “soft” port I/O access modes?

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“Soft” mode provides a higher performance access to ports, but the access may fail if the ports addressed are already in use by another driver (see preceding). “Hard” access provides a more reliable access to ports but it is slower due to its increased overhead for the DeviceIOContol() calls.