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

The Basic Stamp includes a microcontroller like a PIC or SX, a voltage regulator, a resonator as a clock source, an EEPROM for holding Basic program(s) and possibly some data, and some parts to support programming from a PC.  The microcontroller contains an interpreter for the Basic programs in its internal program memory.

The SX is just the blank microcontroller.  You need to supply any voltage regulator and clock source.  You also need a special device for programming (SX-Key) from a PC.  Your program is compiled from a somewhat different form of Basic to assembly, then to a program in binary which is loaded into the microcontroller's program memory.  You can add external EEPROM for storing data, but you can't really store your program there.

The Basic Stamp is easier to use, but much slower than the SX because of the interpreter.  There are a number of features of the SX itself that the interpreter doesn't really use, but are available when programming directly in SX/Basic or SX assembly.

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