Top three calculators ?

[rprosperi]

First, you're right, I confused the 3/4 battery versions of 48GII with the 49g+; sorry for the bad info!!

Thanks for your notes on the 3 revisions/generations!

I was aware of early machines in what you call the first two generations and how they differ from the last category, but wasn't sure that this was indeed due to a running design change; I've always thought this was a matter of luck with which machine you happened to get.

Is there clear evidence that there was a design change, and/or do units fall into these 'categories' based on serial number range? I'm not suggesting you are wrong, just surprised to hear these are distinct versions from differing designs. Please share details if you have them.

Thanks again!