Those used to operating a 100A need to be careful when loading tape into a 100B, as I almost found out the hard way.
With the 100A, you push on the cassette cover to simultaneously seat the cassete holder and close the cover. Do this with a 100B and you risk damaging the camera according to the operation manual. With the 100B, you push on the cassette holder (where marked) and wait for the holder to be completely seated prior closing the cover.
Old habits die hard! Hope this helps someone.
With the 100A, you push on the cassette cover to simultaneously seat the cassete holder and close the cover. Do this with a 100B and you risk damaging the camera according to the operation manual. With the 100B, you push on the cassette holder (where marked) and wait for the holder to be completely seated prior closing the cover.
Old habits die hard! Hope this helps someone.