The Amethyst is a retro-styled “home computer” built around an Atmel ATmega1284 microcontroller. It features composite (NTSC) video output with both high-color and high-resolution modes, mono audio output, and a full-travel mechanical keyboard. It includes a full-featured implementation of the powerful Forth programming language, with graphics and sound commands, debugger, and screen editor.
A single USB Type-B cable provides 5V power as well as serial communication with a PC. Amethyst is compatible with the Optiboot (Arduino) bootloader, and new firmware may be uploaded to it without a specialized programming device.
ATmega1284 microcontroller (8-bit) running at 14.318 MHz
16KB internal memory (16352 bytes available for applications)
4KB nonvolatile EEPROM memory
Mechanical keyboard with Cherry MX keyswitches
NTSC color and monochrome composite video output:
256-color, 16-color, and 4-color bitmap graphics at resolutions up to 160×200 pixels
Monochrome bitmap graphics at resolutions up to 640×200 pixels
40×25 and 80×25 monochrome text modes
40×25 color text mode
40×25 color tiled graphics modes
Single-channel audio output (pulse wave or PWM)
USB serial communication at speeds up to 57600 baud
Four SPI expansion ports for peripherals, controllers, and storage devices
Only 6 chips (ATmega1284, FT320X, 2x 74HC157, 2x 74HC166)
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.