This weeks most popular question.
Buy these machines and get a great timing PC with a serial port, USB ports, 14" great XVGA screen, ultra bay with CDRW and small enough to carry without hassle.
PST prefers Windows 2000 for timing and scoring. If you must use XP professional.
IBM reconditoned machines are the best value going in our opinion. Buy now as machines with native serial ports are going fast.
http://www-132.ibm.com/search/refurbished.html
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