Communication-Protocols ; SPI, I2C, Wireless, etc.
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Data-Structures ; Primitive circular buffer, etc.
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System-Software ; Assembler, Disassembler, etc.
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Programming-Tools ; Development support, helpers
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Programming-Pearls ; Examples of idiomatic (Forth) programming style
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User-Applications ; Games, Robotics, etc.
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Curiosities ; Not so serious contributions but interesting and/or entertaining.
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Sensors ; Electronic sensors for measuring temperature, distance, etc.