Article ID: Q700008
The information in this article applies to:
One requirement for the Serial Port Sharing feature of Direct I/O is an ACPI-enabled system.
This article discusses a way to utilize Direct I/O on non-ACPI-enabled systems.
Beginning with Windows 2000 Microsoft introduced ACPI as favorite method for hardware controlling and system configuration.
There are however systems around incapable to meet the demanding hardware and software requirements ACPI imposes. These systems are handled by Windows as Standard PC.
Direct I/O introduced in version
4.3 the Serial Port Sharing feature which allowed to share serial ports between
and the system.
You can utilize Direct I/O on these systems too however you will not have the Port Sharing.
Follow the steps given below to change the Direct I/O installation:
Before Direct I/O will allow you
to control the port it has to be disabled for Windows.
If you should want to give back the port to Windows you could select Enable in the above step. The port won't be available for Direct I/O anymore.
This problem will be addressed in a future version of Direct I/O.