HP-48S vs. 48G vs. 42S

[rprosperi]

(07-03-2016 06:25 AM)JDW Wrote:  But if SpeedUI Lite requires only a 32k device why then must it be an X model? Why wouldn't a 48S, or even a 28S work?

The 48SX is lacking some of the OS functions (which were added with the GX) used by SpeedUI, and the 28S is missing even more of these needed functions.