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A few reasons may be that 1 most people don't like change, 2 the ScrollPoint performs too fast without drivers, 3 IBM didn't push marketing or continue to really develop the product into the mainstream.
Ideally it would be nice to have the transparency tracking features of Revision A, coupled with revision A's more sensitive ScrollPoint, and revision B's faster cursor sensitivity.
Fixing the divot on the button plastic. These mice are no longer manufactured as previously mentioned to be fair, 9 years is a rather long manufacturing period for a computer peripheral. No mechanical ball to get dusty, dirty or stolen.
IBM ScrollPoint Pro (31P) Mouse | eBay
It should be possible to dump the ROM and modify it to add more features and tweaking to how windows should respond to the ScrollPoint ideally more behaved like the TrackPoint scrolling. First and foremost, it's interesting the earlier IBM mouse lacked a detachable USB cable-- and all of the sudden in the later models they implement this which is helpful when you have to disassemble these mice en-masse.
The first version of the standard three-button ScrollPoint mice were announced in around This however is incorrect, all ScrollPoint mice use the same resistive mechanism and all cite the same patent.
This mouse has its fair share of drawbacks too.
These mice came in two colours, black and ivory: I am not opticwl if the sensor will pick it up, but it should; and if it does, you'll have a more intuitive mouse able to hit more surface variations. Speed optocal controlled based on the pressure applied for continuous-dynamic scrolling; this reduces the strain on the finger caused by standard scroll wheels and also allows the user to adjust the speed on a variable basis not fixed to a set interval at any given time.
Lenovo ScrollPoint Pro - mouse - PS/2, USB - slate blue Overview - CNET
IC replacement Another possible yet less practical solution might be to replace the optical sensor entirely optcial a superior one able to operate on transparent surfaces, but opticzl would have to match the PCB pinout. And finally you'll need to cut a larger opening for the clear 'window' piece that allows blue illumination through. These early ScrollPoints were mistakenly reported to use pressure pads instead of the resistance measuring mechanism as found on the TrackPoint.
The models for both mice are the same, however the part number varies depending on which colour you get. The dpi optical sensor is more accurate and faster than before.
If I ever get a chip programmer I will update this section with more information. If you rely on the ScrollPoint over a conventional 'wheel' mouse and are seeking to increase the performance and capability of your ScrollPoint; there are a few modifications that can help the existing sensor used in these mice.
Lenovo no longer manufactures any ScrollPoint mice anymore so they're now officially dead. I will at some point try swapping the ICs to determine which one is responsible for the behaviour change. I have a few comments about the revision differences.
The original ScrollPoint mouse debuted in to combine the similar TrackPoint mechanism as found on the ThinkPads to replace a standard mouse wheel. And fortunately you can just use the black rubber siding from a slate blue MO18B so it fits nicely at the top and you get a fresh piece. Make sure there is no excess glue to make the buttons taller in height than they were originally: If you're running a Slate Blue rev.
If you're going to use a Lenovo board, be warned that some people have reported premature failure with them-- most likely due to cold solder joints or prematurely failed capacitors.
Install the latest Lenovo driver which I think makes Chrome see it as a standard wheeled device-- since that's all it has been programmed to see.
The colour is actually very subtle, but the metallic black really has an edge with the glitter in the injection plastic.
The original ScrollPoints used a "cat's tongue" TrackPoint cap: These mice featured an ergonomic curve while retaining sharp angles, and the third button has ihm moved near the thumb area.
IBM ScrollPoint Pro (31P8700) Mouse
Availability ScrollPoint mice generally go under the radar as not too many people are acute to them. Apple Magic Mouse 2 - Silver The mouse naturally fits the curvature of your hand so your palm and fingers can rest comfortably without any problems. Another difference is that the bottom covers are different between the two as well:
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