There is software for the 2650 drag system, XLscore ADV, which will work with the 2600 system. The XLscore ADV is data capture sofwtare which means it does not control the timing system from the PC, it monitors the output of the timer after each race completes and saves the race results. Driver registration and classes exit in the program and it can print timeslips with more information than printing direct from the timer.
You might consider trading in the 2600 timer on a 2650 timer to take advantage of the additional features of the 2650. Or you can trade up to a 2910 and use our XLscore II or XLscore PRO software which does operate the timing system from the PC. Here's a link to the hardware upgrade:
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