28.10.2019
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How to add serial ports to Windows NT Installation of COM ports in Windows NT This document details the installation of COM: ports under Windows NT. Installation notes are included for Non-Intelligent Multi-port and Normal serial interfaces. Non-Intelligent Multi-port serial interfaces are special COM: cards that have an Interrupt Status Register that allows the Device Driver to better service the ports that reside on the card. WARNING: Be very careful when following the procedure for adding ports. If an error is made, you may need to use the emergency repair disk to recover.

To configure multi-port serial adapters for Windows NT. Determine the best IRQ and port address values for your adapter to use in your computer.

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Install the adapter according to the manufacturer's instructions. Using Registry Editor, open the key HKEYLOCALMACHINE SYSTEM Currentcontrolset Services Serial Parameters (For more information on how to do this, see the on-line help for Registry Editor.). From the appropriate table below, add the Serial. Keys under Parameters and add the corresponding values for each Serial. key. The actual values for your computer may be different.

Also, if you have only one serial port on your computer, you may start with Serial1 and Com2. If no serial ports are built into your computer, you may start with Serial0 and Com1. If there are no serial ports built into your computer, the following values need to be added under the HKEYLOCALMACHINE SYSTEM CurrentControlSet Services Serial: Add Value Names Data Type Data ErrorControl REGDWORD 1 Group REGSZ Extended base Start REGDWORD 2 Type REGDWORD 1 Exit from Regedt32, and enter the following 2 commands to activate the changes: NET STOP SERIAL NET START SERIAL The serial ports should now work.

Restarting Windows NT will also activate the changes. Note that COM1: through COM9: can be directly referenced just like a filename from programs and from the command line.

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However, COM10: and above must be referenced with the following syntax:. Com10 The command line MODE command does not recognize ports above COM9. Sample Configuration Key Values The sample below assumes that there are two serial ports already available that will be listed as 'Serial0' and 'Serial1' in the Registry and assigned to COM1: and COM2: respectively. The additional ports will start at COM3. For more than four port adapters, simply continue the pattern for as many ports as needed.

Example: Quadport 4-port adapter at IRQ10, starting port address 500, starting at COM3. You must program the Interrupt Pending Register for the Quadport at 0x0140 or another free range.

The IRQ Pending register will occupy 8 contiguous locations (ie.