PSU for Atari ST

A replacement solderless PSU kit for your Atari ST/STE/MegaST computer

When it comes to vintage or retro computing, replacing the original power supply unit (PSU) is almost a must to ensure the continued functionality of these beloved machines. Over time, the capacitors and components within the original PSU deteriorate due to age and consistent usage. This can result in unstable voltage output, causing erratic behavior or failure of the Atari ST computers. Additionally, an aging PSU poses a significant risk of electrical shorts, which can irreversibly damage the motherboard and other internal components.

Moreover, a deteriorating PSU can lead to overheating, increasing the likelihood of sudden shutdowns, data corruption, or even fire hazards, putting the entire system at risk. It is also the leading cause of SidecarTridge multi-device emulator failures. The PSU for Atari ST is a recommended upgrade for SidecarTridge users to ensure the longevity and reliability of their computers, protecting countless hours of retro gaming or creative productivity.

Upgrading to a modern, reliable PSU provides a stable power source, ensuring the computer operates smoothly and safely while safeguarding the motherboard and other key components. Whether keeping a classic system in pristine condition or breathing new life into an Atari ST that’s been stored away, updating the PSU is a crucial step to preserve and protect these iconic computers for many years to come.


The replacement PSU is based on the popular Mean Well RPD-60, a reliable and efficient power supply unit well-suited for retro computing needs. This PSU package includes all the necessary cables to connect seamlessly to the Atari ST motherboard and the AC power plug, ensuring a straightforward solderless hassle-free installation process.

Moreover, a custom riser board is included to securely mount the Mean Well RPD-60 in the original location of the old PSU. This riser board maintains the correct positioning and alignment, making the new unit fit comfortably within the existing structure of the Atari ST computers. This thoughtful design ensures that replacing the PSU is straightforward while offering a modern, stable power source that keeps the system running smoothly and reliably for years to come.

Kit Contents

The PSU Kit for Atari ST is designed for easy installation, providing a comprehensive selection of high-quality components:

  1. Riser PSU PCB for Mean Well RPD-60A PSU: A custom-designed riser board that securely holds the Mean Well unit in the original framework, allowing a seamless fit in the original PSU location.
  2. Mean Well RPD-60A PSU: A robust and efficient power supply unit known for its reliability, offering stable voltage output tailored to the Atari ST’s power requirements.
  3. 8x Philips M3 4mm Screws: Precision screws to fasten the riser PCB securely.
  4. 4x M3 4mm Nuts: To hold the PSU firmly in place, providing stability and reducing the risk of movement.
  5. 4x M3 0.5mm Washers: Essential for securing the screws and ensuring a snug fit.
  6. JST VH3.96 6-pin Female Connector to 6-pin TE-171822-6 Female Connector (10cm): A specialized connector cable to establish a reliable connection between the motherboard and the new PSU.
  7. JST VH3.96 3-pin Female Connector (10cm, with 2 Pins Connected): A connector cable for AC power input, ensuring a secure and stable connection.
  8. 2-pin Speak-on Terminal Block: Provides a firm and secure AC connection, maintaining consistent power delivery.

These components are carefully selected to ensure a seamless installation process, allowing users to replace the original PSU with minimal effort and no soldering required.

Easy Installation

Getting started with the PSU for Atari ST is straightforward and intuitive. You can read the Quickstart guide here and follow the step-by-step instructions to set up your solderless PSU kit for your Atari ST/STE/MegaST.

Frequently Asked Questions

How Difficult Is It to Open the Atari ST and Replace the PSU?

Opening the Atari ST is a fairly simple process that requires only basic tools. It involves removing the screws that secure the case, then carefully lifting the top plastic cover. The computer is enclosed in a metal shield, which can be partially removed by unscrewing the securing screws. However, complete removal of the shield is not necessary to access and replace the PSU in the Atari ST and STE models.

In the MegaST models, the entire metal shield must be removed to access the PSU. With some basic preparation and attention to detail, replacing the PSU can be a straightforward task.

You can find plenty of resources online that provide detailed instructions on opening the Atari ST.

Can I Use the PSU for Atari MegaSTE Computers?

No, the MegaSTE series are not supported.

Can I Use the PSU for Atari TT Computers?

The PSU has not been tested with the Atari TT series.

Is the PSU Compatible with the Atari Falcon?

The PSU is not compatible with the Atari Falcon series.

Can I Use the PSU for the Atari 520ST or 1040ST external power supply?

The PSU is not compatible with the external power supply units of the Atari 520ST or 1040ST models. Though the Mean Well RPD-60A can be used to power the Atari 520ST or 1040ST computers directly, this kit not designed to replace the external power supply units of these models.

How much is the weight of the PSU kit?

200 grams.

What is the size of the PSU kit?

The dimensions of the PSU kit are 100mm x 100mm x 50mm.

Can the PSU harm my computer?

Since the PSU has been designed to meet the power requirements of the Atari ST series, it is unlikely to harm your computer. However, it is essential to follow the installation instructions carefully to ensure that the PSU is connected correctly and securely. If you have any concerns or questions about the installation process, please contact us for assistance.

Why don’t you ship to some European countries?

I’ve made the difficult decision to discontinue shipping to Austria, Bulgaria, Cyprus, France, Greece, Latvia, Lithuania, Luxembourg, Portugal, Romania, Slovakia, and Sweden. This decision was not made lightly and is primarily due to the specific and significant costs associated with recycling packaging and electronics in these countries. Unfortunately, these costs are disproportionately high relative to the demand I’ve experienced, making it unsustainable for me to offer the products in these markets while adhering strictly to the legal requirements.

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