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I have the non-EC version. The firmware it came with was the older firmware which still seems to have a tracking bug in it. I've ordered a serial to usb converter to update it with so that shouldn't be a problem for long.
One thing I've noticed is that standard serial to usb converters work fine for ASCOM control, but not for the firmware updater, not sure why. According to the cloudy nights thread the keyspan model works fine for updating.
I don't thing the cem60 is a belt drive system, but both versions (encoder and non-encoder) have gps
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