256K of FLASH and 32K of RAM Can be used with Arduino IDE or CircuitPython. 48 MHz 32 bit processor - 6x faster than ATtiny85 Same size, form-factor, and pinout as classic Gemma Native USB supported by every OS (ATtiny85 does not have native USB)
Adafruit GEMMA M0 - Miniature wearable electronic platform
by NeweggConsumer Electronics
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