marlin/buildroot/share/PlatformIO/boards/at90USB1286.json

{
  "build": {
    "core": "teensy",
    "extra_flags": "-DTEENSY2PP",
    "f_cpu": "16000000L",
    "mcu": "at90usb1286"
  },
  "frameworks": [
    "arduino"
  ],
  "name": "at90USB1286.json",
  "upload": {
    "maximum_ram_size": 8192,
    "maximum_size": 130048,
    "require_upload_port": true,
    "protocol": ""
  },
  "url": "https://github.com/MarlinFirmware/Marlin",
  "vendor": "various"
}