The Adafruit Metro RP2350 Credit Card Computer is a credit card-sized board with DVI output and USB host support, letting you plug in a screen, keyboard, and mouse for a compact, retro-style computing setup.
The Adafruit Metro RP2350 Credit Card Computer is a compact, self-contained development board designed to bring a retro-style computing experience to modern hardware.
Inspired by projects like the IchigoJam and recent experimentation around RP2040-based DVI output, this board explores the idea of a small, standalone computer. With support for DVI video output and USB host functionality via PIO, it’s possible to connect a monitor, keyboard, and mouse to create a simple, self-contained system for running programs and experiments.
Designed to match the size of a standard credit card (3.375" × 2.125", ISO/IEC 7810 ID-1), this board is about as compact as it gets while still offering a full computing experience. It has a distinctly retro feel, echoing the early days of personal computing in the 70s and 80s, where you could plug into a display and start writing your own programs.
Whether you’re working in CircuitPython, Arduino, or the Pico SDK, this board provides a flexible platform for building small applications, experimenting with graphics output, or just enjoying a minimal, hands-on computing setup.
Features
With the extra pins of the QFN-80 RP2350B, we're able to jam a huge amount of hardware into this shape:
RP2350B dual 150MHz Cortex M33 microcontroller
PicoProbe debug port
16 MB Flash + 8 MB PSRAM - the PSRAM will help when we want do do things like run emulations that we need to store in fast RAM access, and also let us use the main SRAM as the DVI video buffer.
USB type C for bootloading/USB client
Micro SD card with SPI or SDIO
DVI output on the HSTX port
I2S stereo headphone + mono speaker via the TLV320DAC3100
2-port USB type A hub for both keyboard and mouse or game controllers
ESP32-C6 for WiFi / Internet connectivity
Chunky on-off switch
Stemma QT I2C
Stemma classic JST 3-pin
5x NeoPixels
3x tactile switches
16-pin socket header with 10 A/D GPIO + 5V/3V/GND power pins.
Revision History
As of Oct 8th, 2025 – The PCB has been updated with a new A4 Chip.
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