Article ID: Q500003
The information in this article applies to:
- Direct I/O, version 4.2, 4.3,
For Direct I/O, version 4.0, 4.1 see
Normally the parallel port (LPT) is controlled by the operating system. Software
needing direct access to the parallel ports registers does not run properly.
Direct I/O can be configured to grab the
parallel port resources and allow those programs to run successfully.
Follow the steps given below to configure your system properly:
- Open the Direct I/O Control Panel
- Identify the parallel port you want to use and enter the resources in the tab I/O
- Enter the appropriate pathname of your process in the tab Security
- Check if your application utilizes the parallel port IRQ. If you are unsure skip this
You can enter an IRQ later if your application failed to run because of a missing
interrupt.If you are running
Windows 2000 or
Windows XP you have to configure IRQ usage too. Please read article Q700006 for further reference.
- Close the Control Panel
Please read article Q700007 for instructions how to determine
the resources used by your operating system.