Value of HP28C vs 28S?

[Katie Wasserman]

(01-30-2015 01:32 AM)Paul Dale Wrote:  Broadly speaking: the 28S had a usable amount of RAM, the 28C didn't.
No other significant differences.

It's hard to overstate how unusable the 28C is/was due to the extremely limited RAM. You had to turn off the UNDO system to get anything useful done. Trying to use any of the CAS functions was nearly impossible, and storing and sort of substantial program/data, forget about it.

The 28S is/was quite useful and fun. Had I paid for my 28C when I got it new, I would have felt really cheated -- but it was a gift from HP for giving a talk at one of their seminar series.