## Input/Output Device Driver Reference

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### What's New

A new chapter, APM IOCtl Device Driver Test Tool is provided. This chapter explains the Advanced Power Management test tool.

A new chapter, Physical Bidirectional Parallel Port Device Driver was added which describes the PAR1284.SYS device driver.

For information on any items discussed in this reference that have been added to OS/2 beginning with OS/2 Warp Version 3.0 and their compatibility with different versions of OS/2, see OS/2 Version Compatibility Considerations.