Add Storm ST & Cloudy ST page under Atari corner with photos

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2026-09-11 23:35:01 +02:00
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- title: "🔌 Networking & BBS"
summary: "Getting an Atari ST online via STinG and Wi-Fi modem hardware, and dialing into classic bulletin board systems."
href: "/retro/atari-networking-bbs/"
- title: "🌀 Storm ST & Cloudy ST"
summary: "Adding 8 MB Alt-RAM and flashable TOS to the Mega ST, switching between EmuTOS and TOS 1.04."
href: "/retro/storm-cloudy/"
- heading: "Amiga Corner"
cards:
- title: "⚔️ Vampire, A600GS or MiSTer"
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---
title: "Storm ST & Cloudy ST: Flashable TOS and Alt-RAM for the Mega ST"
section: "retro"
tags: "retro"
description: "Installing the Storm ST (8 MB Alt-RAM) and Cloudy ST (flashable TOS) combo in my Atari Mega ST, switching between EmuTOS and TOS 1.04."
layout: base.njk
parent: "/retro/"
---
<h1>Storm ST &amp; Cloudy ST: Flashable TOS and Alt-RAM for the Mega ST</h1>
<div class="detail-content">
<p>I just installed the new Storm ST and Cloudy ST combo in my <a href="/retro/atari-mega-st-fleet/">Mega ST 4 "Low"</a> machine. Now I can switch from EmuTOS 1.0.1 to TOS 1.04 and also have 8 MB of Alt-RAM under EmuTOS.</p>
<h2>The Cloudy ST</h2>
<p>The Cloudy ST is an extremely compact TOS adapter for Atari ST, STM, STF, STFM and Mega ST. It allows you to switch between two TOS ROMs: one ROM comes with EmuTOS preinstalled, the other one can be flashed via software, for example with TOS 2.06 or TOS 1.0x. It works together with the <a href="https://wiki.newtosworld.de/index.php?title=Storm_ST" target="_blank">Storm ST</a> and/or the Lightning ST, needs an address decoder (hexE00000) which the Storm ST provides, and is fully compatible with TOS 2.06, EmuTOS and TOS 1.00 - 1.04 (on mainboards that support 1 Mbit ROMs).</p>
<h2>The Storm ST</h2>
<p>The Storm ST is a compact add-on for the Atari ST, STM, STF, STFM and Mega ST that adds 8 megabytes of alternate RAM, usable with TOS 2.06, EmuTOS and MagiC. (Alternate RAM is not supported by TOS 1.x.) It also provides the address decoder for TOS 1.0x, 2.0x and EmuTOS, making it the perfect companion for the Cloudy's flashable TOS board, plus a connector for an optional real-time clock. With EmuTOS, Alt-RAM and the RTC are detected and used automatically with no software required.</p>
<h2>My Setup</h2>
<p>With the Storm ST and Cloudy ST combo in place, the machine boots into EmuTOS 1.0.1 with all 8 MB of Alt-RAM available, or switches over to the classic TOS 1.04 for maximum software compatibility with games and demos from the era. It's the best of both worlds: the modern conveniences of EmuTOS combined with the authentic behaviour of the original TOS.</p>
<h2>Gallery</h2>
<img src="storm-cloudy-1.jpg" alt="Storm ST and Cloudy ST installed in the Mega ST" width="590" height="443">
<p class="caption">The Storm ST and Cloudy ST combo installed in the Mega ST.</p>
<img src="storm-cloudy-2.jpg" alt="Storm ST and Cloudy ST board detail" width="590" height="443">
<p class="caption">Close-up of the Storm ST and Cloudy ST boards.</p>
<img src="storm-cloudy-3.jpg" alt="Storm ST and Cloudy ST with wiring" width="590" height="443">
<p class="caption">The Storm ST and Cloudy ST with their wiring in place.</p>
<img src="storm-cloudy-4.jpg" alt="Storm ST and Cloudy ST final install" width="590" height="443">
<p class="caption">The finished installation in the Mega ST.</p>
<h2>Sources</h2>
<ul>
<li><a href="https://wiki.newtosworld.de/index.php?title=Storm_ST" target="_blank">Storm ST - Atari Wiki-NEU</a></li>
<li><a href="https://wiki.newtosworld.de/index.php?title=Cloudy" target="_blank">Cloudy - Atari Wiki-NEU</a></li>
</ul>
</div>
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