NoteHKLM\SYSTEM\CurrentControlSet\Services\Serial
| Data type | Range | Default value |
|---|---|---|
| REG_DWORD | 0 | 1 | 0 |
Determines whether serial ports can be set to the same interrupt request level (IRQ). Some ports do not work properly if two ports have the same IRQ.
| Value | Meaning |
| 0 | Each serial port on the computer must have a different IRQ. |
| 1 | Serial ports on the computer can have the same IRQ. |
Note
The value of this entry is used as the default value for all serial ports on the computer. Settings for specific serial ports are stored in the device-specific subkey for that port in the Enum subkey (HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum).
Tip
To change this value, you must edit the registry. To change the PermitShare setting for a specific serial port, use Device Manager.
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