Top three calculators ?

[carey]

(05-08-2024 01:50 AM)rprosperi Wrote:  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.

I may have first learned about the three generations of HP49G+ keyboards from Eric Rechlin's very informative and comprehensive April 11, 2006 post to comp.sys.hp48 that details the differences between the three keyboard generations, along with corresponding serial number ranges and ROM versions. There may be other relevant posts, but Eric's post appears to be definitive.