MiniST: An FPGA-Powered Atari ST Revival

The Atari ST is enjoying an unexpected new chapter thanks to a fan-made project known as the MiniST. Instead of using traditional software emulation, this compact machine recreates the original 16-bit computer in hardware via an FPGA, while quietly adding modern comforts such as HDMI output, USB peripherals, and SD card storage. It is not a mass-market commercial product, however, and that design choice has big implications for availability, pricing, and what retro enthusiasts can realistically expect.

This article explores what the MiniST actually is, how it works, why it matters to Atari ST fans, and how its small production run compares to other recent retro hardware efforts. We will also look at the open-source nature of the project and how that opens the door to DIY builders even if the prebuilt units are hard to obtain.

From 1980s Workhorse to Modern FPGA Replica

The Atari ST line, first released in the mid-1980s, carved out a niche as a capable 16-bit home computer and a serious tool for musicians thanks to its integrated MIDI ports. According to Atari’s own historical materials and documentation, the original ST offered a Motorola 68000 CPU, graphical desktop, and built-in MIDI connectivity that made it particularly popular for sequencing and studio work.¹ Decades later, that legacy still resonates, and hardware enthusiasts have been searching for ways to preserve the experience without relying on fragile vintage hardware.

The MiniST is part of a broader wave of FPGA-based recreations that aim to reproduce historic systems at the hardware level. In contrast to software emulation running on a generic CPU, an FPGA (field-programmable gate array) is configured to behave like the original chips. This can deliver more accurate timing, lower latency, and better compatibility with software that relies on hardware quirks.

Recent hobbyist and commercial projects have demonstrated that FPGAs are well-suited to this kind of work, from arcade boards to 8-bit and 16-bit home computers. The MiniST brings that approach to Atari’s classic machine while packing everything into a tiny, modern case.

What Exactly Is the MiniST?

The MiniST is an unofficial, small-scale, fan-built recreation of the Atari ST using an FPGA core specifically tuned for cycle accuracy. It is designed to resemble a shrunken-down ST-style computer with a modern feature set laid on top of faithfully reproduced internal behavior.

Core Concepts Behind the MiniST

• Hardware-level recreation: Uses an FPGA board to implement the original logic instead of running an emulator on a standard CPU.
• Modern connectivity: Offers HDMI video output, USB for input devices, and SD storage in place of floppy disks and spinning hard drives.
• Open-source designs: Case designs and hardware materials are made available so others can replicate or modify the project.
• Tiny production run: Only a handful of fully assembled units are planned, making this more a boutique project than a mainstream product.

In other words, the MiniST is best understood as a polished fan build that demonstrates what an official “Atari ST Mini” could look like, rather than a product you can expect to find on retail shelves.

FPGA Heart: Tang Nano and MiSTeryNano Core

At the heart of the MiniST is a combination of Tang Nano FPGA hardware and the MiSTeryNano core. Tang Nano development boards are low-cost FPGA platforms produced by Sipeed and based on GOWIN FPGAs, aimed at hobbyist hardware projects. Official documentation from GOWIN and Sipeed highlights their use in retro-computing and custom digital logic designs.²

The MiSTeryNano core is a community Atari ST implementation initially created for compact FPGA boards. It strives for cycle-exact behavior, meaning the FPGA core attempts to match the timing of the original Motorola 68000 CPU and supporting chips at the clock-cycle level. Accurate timing is essential for:

• Games that rely on tight synchronization with video or sound hardware.
• Demos that use clever tricks exploiting undocumented chip behavior.
• Software that expects specific response times from the system.

By tuning the core to reproduce an 8 MHz 68000 and ST-compatible chipset, the MiniST aims to satisfy purists who care not just that software runs, but that it runs exactly as intended on original hardware.

Supporting Chips and Features Emulated

Beyond the CPU itself, a convincing Atari ST recreation needs to replicate several key subsystems, including:

• TOS ROMs: The operating system, known as TOS (The Operating System), stored in ROM on original machines.
• Sound hardware: Yamaha YM2149 PSG and, for STE features, DMA audio capabilities.
• Blitter chip: Hardware acceleration for block moves used by certain games and demos.
• Disk and storage logic: Support for ACSI (Atari’s hard disk interface) behavior, mapped to SD-based storage in the MiniST.
• MIDI I/O: Physical MIDI ports, a hallmark of the original ST’s appeal in music studios.

Recreating all of these blocks inside the FPGA allows the MiniST to behave like an old ST at the electrical and timing level while still offering modern convenience features.

Modern Ports: HDMI, USB, SD, and MIDI

While the MiniST focuses on authenticity, it is not a museum exhibit. It includes a modern set of ports designed to plug effortlessly into today’s displays and peripherals.

Video and Audio Output

• HDMI video: The MiniST outputs digital video over HDMI, making it compatible with modern monitors and TVs without the need for scandoublers or analog adapters.
• Audio over HDMI or analog: Depending on the specific board configuration, audio can be carried over HDMI and/or provided via a separate output, mapping the ST’s sound to contemporary hardware.

The adoption of HDMI is in line with broader trends in retro hardware. For example, Analogue’s FPGA-based consoles also use HDMI to deliver pixel-perfect output on modern screens.³ The MiniST applies similar thinking in a DIY context.

USB, Storage, and Companion Microcontroller

In addition to the FPGA, the MiniST uses a microcontroller (such as a Raspberry Pi RP2040) as a companion chip to handle tasks like USB input and MIDI routing. Raspberry Pi’s official documentation positions the RP2040 as a versatile microcontroller suitable for bespoke peripheral handling and real-time control applications.⁴

Typical modern conveniences include:

• USB ports for keyboards, mice, and possibly gamepads.
• SD card slot to host disk images or virtual hard drive partitions.
• MIDI in/out ports for musicians who want a compact and modern ST-style sequencer rig.

Open-Source Design and DIY Possibilities

One of the most important aspects of the MiniST is its open-source philosophy. The creator has made it clear that the materials required to build your own unit are freely available. That includes:

• STL files and case designs suitable for 3D printing.
• Information on which FPGA board is used.
• Details on the MiSTeryNano core and firmware setup.
• Guidance on wiring, companion microcontroller, and ports.

This approach resonates strongly with the wider open hardware movement, where schematics and designs are shared so others can learn, modify, and reproduce them. The Open Source Hardware Association emphasizes that open hardware projects allow anyone to study, modify, distribute, make, and sell the design or hardware based on that design.⁵

For the MiniST, the practical result is:

• If you miss the initial wave of prebuilt units, you can still attempt a DIY build.
• Community members can iterate on the design and potentially refine or extend it.
• Third-party makers could, in theory, carry out their own small production runs for local enthusiasts.

Limited Availability: Boutique Hardware, Not a Mass Product

Unlike highly marketed retro mini-consoles or larger commercial FPGA platforms, the MiniST is explicitly a small-batch project. The initial run is limited to just a handful of complete machines. Each includes the FPGA board, case, wiring, and a new keyboard, assembled and tested by the creator.

Key implications of this limited scope include:

• Scarcity: Only a few units will be available for direct purchase, likely snapped up quickly by dedicated collectors and enthusiasts.
• Price point: A boutique device built in extremely small volume cannot benefit from economies of scale. The approximate cost in the mid-hundreds of euros reflects the labor and component costs of hand-assembled hardware.
• DIY emphasis: The open-source nature of the project becomes essential; broader access comes from community replication rather than from the original maker shipping thousands of units.

This stands in contrast to more widely available retro products that use large production runs and extensive distribution. Here, the MiniST is closer to a high-end mod or custom build that happens to be well documented.

How MiniST Compares to Other Retro FPGA Efforts

The MiniST does not exist in a vacuum; it shares the stage with other retro computing and gaming projects that aim to reimagine classic systems in modern form.

FPGA vs Software Emulation

Software-based mini devices, such as classic console reissues built around ARM SoCs and Linux, typically rely on emulation. This approach is easier to scale but can fall short in terms of timing-sensitive behavior, input latency, and obscure hardware quirks. Academic and industry discussions of FPGA-based emulation often highlight the advantage of reproducing hardware-level behavior for precise timing and deterministic performance, especially when dealing with legacy systems that have tight coupling between CPU and peripherals.⁶

In practice:

• Software emulation is usually cheaper and more flexible but sometimes less accurate.
• FPGA recreation demands more specialized design work but can offer near-native behavior.

The MiniST chooses the latter path, prioritizing authenticity even if it limits mass appeal and increases complexity.

Comparison Snapshot

Who Is the MiniST For?

Given its design, the MiniST is aimed squarely at a specific kind of user rather than the mainstream retro market. You are likely in the target audience if you:

• Have a strong interest in Atari ST history, gaming, demos, or music production.
• Care about hardware accuracy and timing, not just the ability to launch a game.
• Are comfortable with or curious about FPGA technology and retro hardware tinkering.
• Appreciate open-source hardware and might want to build or modify your own device.

For those simply looking for a casual nostalgia hit, software emulation on a PC, Raspberry Pi, or off-the-shelf mini console might be more accessible. The MiniST is closer to a passion project that invites deep engagement with the hardware, whether as a buyer of one of the rare prebuilt units or as a DIY builder using the published designs.

FAQs About the MiniST

Is the MiniST an official Atari product?

No. The MiniST is an unofficial, fan-made project and is not produced, endorsed, or licensed by Atari. It is a community-driven hardware recreation that uses publicly available FPGA cores and open-source designs.

Can I buy a MiniST off the shelf?

Only a very small number of fully assembled units are planned, so availability will be limited. Most people interested in a MiniST experience will likely either need to build one themselves using the published designs or wait to see whether third-party makers produce additional runs based on the open-source materials.

Do I need original Atari ST disks or hardware?

No original hardware is required. The MiniST uses SD card storage to load disk images and, where supported legally, TOS ROM images. Users are responsible for ensuring they have the rights to any software they load, including operating system ROMs and games.

How accurate is the MiniST compared to a real Atari ST?

The goal of the MiSTeryNano core and Tang Nano setup is cycle-accurate reproduction of the original machine’s behavior, including 8 MHz 68000 CPU timing, sound hardware, and blitter operations. While no clone is perfect, the emphasis on FPGA-based hardware replication aims to closely match the behavior of real ST hardware, including demanding games and demos.

Is this project suitable for beginners?

Using a pre-assembled MiniST is relatively straightforward: plug in HDMI, USB input devices, and power, then boot from configured storage. Building a unit from scratch, however, requires comfort with electronics, 3D printing (if you want a case), flashing firmware, and working with FPGA boards. Beginners can still attempt it with patience and guidance from the community, but it is not as simple as buying a plug-and-play mini console.

Why the MiniST Matters

Although the MiniST will never reach the widespread audience of mainstream retro hardware, it serves an important role in the preservation and celebration of the Atari ST ecosystem.

• Preservation of behavior: By recreating the system at the hardware level, it helps preserve not just software, but the nuanced behavior of the original chips.
• Open-source legacy: The decision to publish designs ensures that knowledge and improvements are not locked away in a single commercial product.
• Inspiration for future devices: The MiniST stands as a proof-of-concept for what an official, modern Atari ST recreation could look like, potentially influencing future projects.

For enthusiasts, it encapsulates the best of both worlds: the charm and quirks of 1980s computing, wrapped in a compact, modern-friendly package that respects the original machine’s capabilities. Even if only a small number of physical units ever exist, the open-source foundations mean the MiniST’s influence could persist, evolve, and inspire new Atari ST recreations for years to come.