Microsoft KB Archive/816489

= Cannot Type Modem AT Commands in HyperTerminal =

Article ID: 816489

Article Last Modified on 3/28/2003

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APPLIES TO


 * Microsoft Windows XP Professional
 * Microsoft Windows XP Home Edition

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SYMPTOMS
When you try to type a modem initialization command (AT) in the command window of HyperTerminal, you may be able to type only the first character of the modem AT command.

Note Modem AT commands sent by a Telephony Application Programming Interface (TAPI) application to initialize the modem work fine.



CAUSE
This issue may occur if both of the following conditions are true:
 * Hyper-Threading is enabled on your computer.

-and-
 * The AGERE SoftModem driver is installed on the computer.



WORKAROUND
To prevent this problem from occurring, turn off Hyper-Threading.

For more information about how to turn off Hyper-Threading, see the BIOS information for your computer.



MORE INFORMATION
For more information about Hyper-Threading technology, visit the following Intel Web site:

http://developer.intel.com/technology/hyperthread

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Keywords: kbprb KB816489

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