Hi Foodeng,
The AT-A2150 is an old Dynamic Signal Acquisition board that was discontinued in December of 1999. You can read the Discontinuation Notice online at http://digital.ni.com/manuals.nsf/webAdvsearch/65920414414687FE8625678D0056B8B2?OpenDocument&vid=niwc&node=132100_US. According to the Data Acquisition (DAQ) Installation/Configuration Troubleshooter at http://www.ni.com/support/daq/versions.htm, this board requires NI-DAQ 4.9 and Windows 95. Of course, if you use an old version of NI-DAQ, you will also need to use an old version of LabVIEW. I do not recommend trying to use this board, but if you must, you can download old versions of NI-DAQ at http://digital.ni.com/softlib.nsf/webcategories/85256410006C055586256BBB002C1293?opendocument&node=132
070_US. For more information on this board, I recommend reading the User Manual. You can find it at http://digital.ni.com/manuals.nsf/webAdvsearch/9EDE6D8353864B0C862567D20067FACD?OpenDocument&vid=niwc&node=132100_US. I hope this answers your questions.
Regards,
David Shatila
Applications Engineer
National Instruments