## Input/Output Device Driver Reference

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### Functional Support

The bidirectional parallel port device driver is a functional replacement for the OS/2 parallel port device drivers (PRINT01.SYS and PRINT02.SYS). The bidirectional parallel port device driver supports the following strategy commands:

open
read
write
close
ioctl
input flush
output flush
initialize device driver
initialization complete

For more information on the IOCtl commands supported, refer to the Category 05h Parallel Port Control IOCtl Commands found in the Physical Device Driver Reference.