In SX Microcontrollers, SX/B Compiler and SX-Key Tool, TheBandit wrote:

Regarding the control experimentation and datalogging, I found that the BS2 (regular version) was too slow to read a quadrature encoder. I talked to Parallax support and they recommended an SX becuase it's significantly faster than any of the Basic Stamps and should easily handle an encoder. With the BS2 I was able to read a finger-turned 4ppr encoder fine, but it was very unreliable/impractical with a 24ppr encoder and virtually useless for a 360ppr. I dont know if this affects your applications, but it's something to consider.

From my reading it looks like SX/B programming isn't that different from PBASIC. That's about all I can tell you as I am still in process of getting an SX to make the switch.

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