4MB SIMM Memory Expansion for Atari STE & Mega STE

Boost your Atari STE & Mega STE with 4MB of high-quality SIMM memory for better performance and compatibility.

Give your Atari STE or Mega STE a serious performance boost with this 4MB memory expansion kit. Designed for seamless compatibility, this kit includes four 1MB SIMM modules, ensuring your classic Atari has the memory it needs to handle modern homebrew software and demos with ease.

Key Features

New Old Stock (NOS) RAM Chips

These are not recycled or refurbished chips. Each module is built with NOS (new old stock) DRAM chips, carefully sourced and assembled by SidecarTridge to ensure top-tier compatibility and long-term reliability.

Optimized for Atari STE & Mega STE

Designed and tested specifically for Atari STE and Mega STE systems, these SIMM modules work flawlessly in both stock and modified machines.

No Parity Bit for Better Stability

The Atari STE and Mega STE do not use a parity bit, so these modules exclude it—reducing potential issues with noisy system buses and ensuring smoother performance.

Low-Profile Design

The modules are just 15mm tall and 1.2mm thick, making installation easy while fitting neatly inside the Atari STE and Mega STE cases without modification.

Simple Plug-and-Play Installation

Upgrading is as easy as:

• Opening your Atari STE or Mega STE
• Removing existing memory (if installed)
• Inserting the four 1MB SIMM modules into the slots in the middle of the motherboard

Each module is keyed for correct orientation, ensuring a hassle-free installation.

Important Notes for Accelerated Systems

These modules use 60ns DRAM chips with a 110ns cycle time, making them perfect for:

• ✅ Stock Atari STE (8MHz)
• ✅ Mega STE (8MHz and 16MHz)

⚠️ If you have an accelerated Atari, compatibility is not guaranteed. While testing has shown they work fine in a 16MHz Mega STE, performance in other accelerated systems may vary.