Dylan Brophy aka Nuclaer Tech has created a Teensy 4.1 carrier board called the Teensy 4.1 Computer, which equips the microcontroller with SBC-like ports and form factor.

Four USB ports, an Ethernet jack, and high-quality audio output make it ideal for synths, game consoles, computer emulation, and other highly-connected projects.

In addition to the typical Arduino-based development workflow, the board supports Teensy NTIOS, an Arduino-based operating system, complete with shell. Other features include a TI TUSB2046B
four-port USB 2.0 12-Mbps hub, 1A+ per port with overload protection, and a PCM5102 stereo DAC and OPA1688 low-distortion op-amp to deliver optimal audio to the onboard 3.5mm audio jack.

The assembled board is available on Tindie, with detailed specs and schematics on the project wiki. The Teensy NTIOS source can be found on the project’s GitLab server.