
Adafruit ItsyBitsy M4 Express
Dev Board
High-performance compact board with ATSAMD51 Cortex M4F at 120MHz, 192KB RAM, 512KB flash, 2MB SPI flash, dual 12-bit DAC/ADC, 18 PWM outputs, AES-256 crypto, and native USB. Measures 36mm × 18mm.

Adafruit Feather M4 Express
Dev Board
High-performance Feather with ATSAMD51J19 Cortex M4F at 120MHz, 192KB RAM, 512KB flash, 2MB SPI flash, dual 12-bit DAC/ADC, AES-256 hardware crypto, LiPo charging, 21 GPIO, and native USB HID. Feather

Adafruit PyBadge LC
Dev Board
Low-cost credit card-sized gaming/badge board with ATSAMD51J19 at 120MHz, 1.8\" 160x128 TFT, 8 game buttons, 1 NeoPixel, light sensor, buzzer, 2MB SPI flash, and MicroSD. Supports MakeCode Arcade, Cir

Adafruit Metro M4 Express AirLift
Dev Board
Arduino Uno-compatible board with ATSAMD51J19 Cortex M4F at 120MHz, ESP32 AirLift WiFi co-processor with TLS/SSL, 512KB flash, 192KB RAM, 2MB QSPI flash, 25 GPIO, dual DAC/ADC, and native USB. Arduino

Adafruit PyBadge
Dev Board
Credit card-sized gaming and badge board with ATSAMD51J19 at 120MHz, 1.8\" 160x128 TFT, 8 game buttons, 5 NeoPixels, LIS3DH accelerometer, light sensor, 2W speaker, 2MB SPI flash, Feather headers, STE
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More to explore — popular traits shared by devices with RAM: 192 KB.