The BS2sx is an SX processor with a proprietary Basic interpreter pre-programmed into the SX's flash memory. The SX module also includes a voltage regulator, EEPROM for holding the interpretive program, and some interface logic for programming the EEPROM. The interpreter executes about 4000 interpretive instructions a second.
Using SX/B with an SX processor is much faster and makes available more than the normal 16 I/O pins of a BS2sx. The SX can execute as much as 50 million instructions a second although the instructions don't usually do as much as the BS2sx interpretive instructions. SX/B is a compiler for a version of Basic that's deliberately very similar to the Basic used by the Stamps. It's not identical and there's a lot you would have to learn about using SX/B that's different from the BS2sx Basic, but there are some excellent texts and magazine columns available for downloading from Parallax to help you with that.
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