|Re: HP-15C - are they all exactly same|
Message #2 Posted by Raymond Del Tondo on 26 Nov 2003, 9:58 p.m.,
in response to message #1 by Miki Mihajlovic
The greatest change I can recall was the chnage of the pcb, from separate pcbs for the keyboard & display to a single pcb for all components. While changing the pcb, they also changed the battery contact springs, or more precise, they reduced it to *one* single spring, and a static contact pole on the pcb side.
As far a I remember from the units I opened so far,
the also was a change in the pcb 'naming'. The old 11C pcbs hadd the 11 printed on, the newer 11C's used a 15C pcb, but with one memory chip less than the actual 15C.
New pcbs won't fit into old style cases, mainly because of the changed battery contacts.
There may be more differences, but I don't recall them now.
Here are some people who know many more details about these nice machines, maybe they have better answers.