## Input/Output Device Driver Reference

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### Parallel Port Device Driver Support

All the Category 05h IOCtl commands are supported by the parallel port device driver. Additionally, the following IOCtls are also supported by the parallel port device driver:

Category 0Ah Character Monitor Control. Supported by the physical keyboard, mouse, and parallel port device drivers.

Function 40h Register (A character monitor)

Category 0Bh General Device Control. Supported by all the character device drivers.

Function 01h Flush input buffer

Function 02h Flush output buffer

Function 60h Query monitor support