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External mouse feature on TP750s



Hi!

I have tested several mouses (yes, the TrackPoint is great) on both the 
TP750 and TP350 series. It appears that there is something in the 750s 
design that makes some mouse designs incompatible. The problem appears when 
the mouse button is pressed. TP750 respondes to the press only randomly. A 
double click is really hard to produce. The following mouses has been tested

Mouse                   TP750 (several units)   TP350(several units)
Logitech Pilot          works                   works
Logitech MouseMan       don't work              works
IBM M96F9275            don't work              works   (logitech design i   
                                                      think)        

The apparent difference between the twon logitech mouses is that Pilot is 
rated as 5V 25mA whereas mouseman is 12V 10mA. Can this be the reason or is 
this yet
another design flaw in the 750. 

Should we generate a TP750 hardware bug list. 
Antti Kilpinen, Ph.D (Chem.Eng.)
Institute for Advanced Management Systems Research
Abo Akademi University
DataCity
FIN-20520 Turku