The maker ecosystem isn't standing still, and Adafruit is reigniting the momentum with Fruit Jam, a credit-card-sized mini computer designed for hassle-free tinkering, learning, and building. Its ID‑1 format and its approach to mini-SBC with RP2350 brain make it a serious toy for retro emulation, educational projects, and small embedded systems requiring display, audio, and USB peripherals.
Although the idea came about through joking and caffeine, there's a lot of design behind it. Adafruit took that spark from the Hackaday chat with Eben Upton about the IchigoJam-inspired DVI-over-PIO output and took it to the extreme: If you combine DVI video, USB host and a powerful microphone, you get a standalone pocket computer.Fruit Jam embodies just that, and it's packed with handy extras to get you creating right out of the box.
Key specifications and architecture
The heart of the board is the Raspberry Pi RP2350B microcontroller in QFN‑80 package. This chip can operate with two Arm Cortex‑M33 cores at 150 MHz or with two RISC‑V Hazard3 cores at 150 MHz, offering unusual flexibility in choosing the ecosystem and development tools; some early articles described a simultaneous combination of both, but the technical description suggests using one or the other mode, not all four cores at once.
It is also not short on memory: integrates 520 KB of on-chip SRAM and adds 8 MB of external PSRAMThat PSRAM is a great option for emulation and workloads that require faster RAM, freeing up the main SRAM, for example, to use as a DVI video buffer. For storage, it includes 16 MB of QSPI flash and a microSD card reader compatible with SPI or SDIO, so you can expand the storage space without any hassle.
It's worth noting that some of the earlier coverage also talked about a supposed design based on either the Raspberry Pi Pico 2 or the veteran RP2040 with 264KB of RAM, But the version that Adafruit has put on the showcase is the RP2350B with the jump in performance and efficiency that this entails.The generational change fits with the project's objective: to combine 720p video, audio, peripherals, and modern connectivity on a single card.
The plate is the size of a credit card: 85,725 × 53,975 mm, i.e. 3,375 × 2,125 inches, compliant with ISO/IEC 7810 ID‑1. That compact footprint doesn’t hinder a surprisingly long hardware list, as you’ll see below.
Ports, connectivity and expansion
Fruit Jam relies on standard ports so you can plug in almost anything without any fancy adapters. It has a multifunction USB Type-C for power, data and bootloading, and also integrates two USB Type-A ports in host mode for keyboard, mouse or game controllers, thanks to a hub that solves 90% of your interaction needs without additional hardware.
In wireless connectivity it comes very well equipped thanks to an Espressif module: ESP32‑C6 for WiFi 6 in 2,4 GHz and Bluetooth 5This enables IoT projects and connected applications with a modern and efficient radio, keeping power consumption at bay. As an added nod to remote control, the board integrates an infrared sensor with which you can receive orders from an IR remote control in living room setups or interactive kiosks.
To expand, Adafruit does not crop: STEMMA QT for I2C, the classic 3-pin JST STEMMA connector, 16-pin header with 10 GPIO A/Ds plus power at 5V and 3,3V, and, in some specification listings, EYESPI connector for displays or high-speed peripherals. This ecosystem of ports is what makes the board so useful for learning electronics without struggling with soldering or loose cables.
There is also a crucial detail for those who debug deeply: PicoProbe debug port integrated, which makes it much easier to enter with a debugger to understand what is happening in your firmware or in the PIOs. In addition, it includes a generous ignition switch, three accessible touch buttons and five NeoPixel LEDs that provide immediate visual feedback without the need to mount anything extra.
Video and audio: DVI at 720p and I2S with dedicated DAC
Video output is handled by the RP2350's HSTX subsystem: DVI with support up to 1280 × 720 pixelsThat 720p resolution is more than enough for lightweight desktops, classic emulators, and educational applications, and it keeps the timing within what the microphone can consistently push.
In audio, Adafruit has not stopped at simple PWM. Integrates an I2S DAC TLV320DAC3100 which provides a stereo headphone output and a mono speaker output. The kit itself includes a mini speaker, so you can have working audio without soldering anything. For demos, retro games, or sound interfaces, the leap in quality compared to basic solutions is noticeable.
This combination of DVI and I2S also has its historical context: The idea of ​​releasing DVI with PIO came to the community as a result of the IchigoJam-inspired experiment., and here it's packaged in a rugged, build-ready format. The result is a machine reminiscent of the microcomputers of the 70s and 80s, but with modern conveniences and a 2025 workflow.
Compatible software and real-life usage examples
On the software side, the board is prepared to work in the most popular environments of the Raspberry Pi microcontroller family: supports CircuitPython, Arduino IDE and the Pico SDK for C/C++This allows you to move between rapid prototyping, mature libraries, and low-level development as the project demands.
The official guides also include demo scripts in CircuitPython These functions teach how to operate the display, draw shapes and graphs, or present data. Sample functions that run in loops include show_shapes for basic shapes, sine_chart for plotting a sine wave, widget0 and widget1 for line and bar visualizations, text_align for testing text alignments, custom_font for loading bitmap fonts, bitmap_example for displaying images, and sensor_values ​​for refreshing readings with display group scaling. These are perfect demos for learning how to structure scenes and optimize memory. in projects with video output.
As a technical curiosity, during the gestation of the concept it was even considered USB host per PIO with bit banging, underpinning the idea of ​​a standalone computer. Today, the final design seamlessly integrates these aspirations: USB-A peripherals, microSD storage, DVI video, and I2S audio, all from a single board.
Physical design, materials and kit included
The attention to detail is evident when you open the box. Adafruit delivers assembled and tested Fruit Jam, with a protective top plate secured with three nylon screws. There's no metal spacer next to the ESP32-C6 antenna to prevent interference, a sensible decision when you're looking for good Wi-Fi and Bluetooth reception.
In addition to the cover, the mini-kit includes a tiny speaker ready to connect and a set of bumpers to sit the board on the table without scratching it. On the edge, the chunky ignition switch It is comfortable and clear, which is appreciated when you alternate between programming sessions and quick tests.
The ID‑1 footprint makes it possible to fit the board into wallets, hard cases, or very compact 3D-printed holders. This compactness does not penalize usability thanks to the good arrangement of ports.: USB-C on one side, two USB-A peripherals within easy reach, the 16-pin header aligned, and the STEMMA connectors accessible for wiring sensors in a snap.
Performance and practical limits
With 150MHz cores and a combination of SRAM and PSRAM, Fruit Jam easily runs 2D interfaces, 8- and 16-bit emulators, and lightweight desktops for notepad tasks, basic drawing, or simple media players. The reasonable limit for DVI output is 720p., sufficient for current displays and with timings that the RP2350 handles reliably without ruining latency.
Dedicated DAC audio provides quality and flexibility compared to PWM or resistor DAC solutions. For education and prototyping, being able to plug in stereo headphones and a mono speaker without any awkward setup is a plus.The presence of WiFi 6, albeit at 2,4 GHz, combined with Bluetooth 5, opens the door to connected projects with significant room for growth in the future.
Price and Availability
The PVP that is repeated in the cards and articles is 39 to 39,95 dollars, a logical figure given the integrated hardware package. On the official storefront, it has occasionally been marked as out of stock, with units flying off the shelves, and even with very low stock counts. Adafruit ships to Europe, but import taxes and fees are not included., so it's worth considering if you're buying outside the United States.
As for the schedule, it was mentioned that the board went through a final production phase while waiting for the first PCBs to be assembled, and shortly after entered general availability with rapid restocks that tend to sell out. It's the classic pattern of maker releases that raise expectations: batches arrive, sell out, and then come back.
Comparisons and close alternatives
If you look at the RP2350 ecosystem, there are cheaper boards based on the same chip, such as options from Waveshare starting at around $19. The difference is in the turnkey package: Fruit Jam comes standard with a dual-port USB hub, DVI-ready, an I2S DAC with stereo audio and speakerphone, WiFi 6 and Bluetooth connectivity, plus STEMMA, NeoPixel LEDs, buttons, and a cover. For complete mini PC options, check out options like PINE64 that follow the philosophy of compact systems.
Another interesting alternative is the orientation of projects like Olimex RP2350pc, with a specific focus on emulating Apple systems and user libraries to compile with a kind of unified BIOS-style API. Fruit Jam can cover similar ground in retro emulation, but with more integrated inputs and outputs to build complete user experiences with display, sound and peripherals.
If what you need is the minimum cost per GPIO pin and you don't mind soldering or adding external modules, A bare plate at a reasonable price may be enough for you.If, on the other hand, you value opening the box and having video, audio, USB, and networking without adding any additional parts, Fruit Jam justifies that extra on the receipt.
Use cases: education, prototyping, and IoT
For the classroom and workshops, Fruit Jam fits like a glove. Programming in CircuitPython lowers the barrier to entry, and when it comes to optimizing or downsizing, Arduino or the Pico SDK take full control. Connecting a keyboard, mouse, and DVI monitor and emulating a classic Macintosh is a powerful demonstration to engage beginners.
In embedded systems it operates with low power consumption, inheriting the good performance of the Raspberry Pi microcontroller family. The PSRAM and microSD combo allows for caching and recording of data, while the 2,4 GHz radio handles telemetry or remote control. With the 16-pin header and STEMMA, a sensor station or small control panel can be assembled in an afternoon.
For those who yearn for microcomputers, the retro nod is not just cosmetic: 720p via DVI, decent audio and USB peripherals They let you program small applications, simple games, and demos with an experience very similar to that of those devices, but making use of modern tools and well-documented libraries.
Notes and nuances of the specifications
There are nuances among the initial coverages that are worth clarifying. The architecture was described as two M33 cores plus two Hazard3 cores, when current technical listings speak of a choice between both dual modes. A supposed origin in the Raspberry Pi Pico 2 with RP2040 was also cited; today, the production model marketed and documented is the RP2350B.
In the video, several sources point out the DVI output via HSTX and a maximum of 1280 × 720, a figure consistent with real-life experiences from the community seeking stability and clean timings. In terms of connectivity, the ESP32-C6 offers 2,4 GHz WiFi 6 and Bluetooth 5, adapting to the vast majority of home and educational networks where the 2,4 GHz band still reigns supreme.
Finally, the package includes: protective top plate, nylon screws, mini speaker and a bumper kitThey're small accessories, but they make a difference when you go from a prototype on a table to something that can be displayed or installed without custom housings.
Fruit Jam stands out as a solid, ready-to-use base for those looking for a compact board with integrated video, audio, USB, network and expansion; It is not the cheapest in the RP2350 ecosystem, but it is one of the most complete. to learn, experiment and have fun with lightweight computing and classic emulation.
