Downloads
Official builds and application updates from Mean Hamster Software.
Looking for C64 or Atari games? Choose how to play to compare native games with MPE cartridge assistance. Find product help.
HamsterOS for PCs
Free disk images for 386-class and 8086/8088/V20 PCs.
Choose the standard HamsterOS .77.19 1.44 MB image for 386-class PCs, or HamsterOS CGA in 720K and 360K editions for 8086, 8088, and V20 computers.
HamNet & HamChat
One download center for every supported computer.
Choose HamNet and HamChat for HamsterOS, supported Amiga systems, or Classic Mac OS. Standalone HamChat is also available for Windows 10/11 and modern macOS.
- AmigaOS: HamNet 1.0.10 + HamChat 0.6.5
- Classic Mac: HamNet 1.0.10 + HamChat 0.6.5
- Windows: HamChat 0.6.5
- HamsterOS and modern macOS choices are included
Sierra Game Compiler
AGI-64 + AGI-ANTIC · Windows or Mac · Windows v1.1.16
Native games run entirely on your classic computer’s own CPU; the cartridge supplies storage. Prepare on Windows or Mac, then play without the preparation computer connected.
Supported systems, titles and release notes
Build 14 original Sierra AGI titles and 3 fan-made adventures for the Commodore 64. The same compiler includes AGI-ANTIC for Atari 8-bit computers, with 17 supported adventures: The Black Cauldron, Donald Duck's Playground, Gold Rush!, Mixed-Up Mother Goose, King's Quest I, King's Quest II, King's Quest III, King's Quest IV (AGI edition), Leisure Suit Larry, Manhunter: New York, Manhunter 2: San Francisco, Police Quest, Space Quest I, Space Quest II, Space Quest 0: Replicated, King's Quest VI AGI demake, Space Quest: The Lost Chapter.
New in Windows 1.1.16: Adds Space Quest: The Lost Chapter for C64 and Atari XL/XE, bringing both catalogs to 17 adventures. Atari arrow keys work without Control for walking, menus and inventory. Coleco ADAM gains rendering, data transfer, caching and event-processing improvements. The first-use tutorial is retained.
Retains Highly Experimental King’s Quest I and Space Quest I builds for MSX2, Coleco ADAM and TI-99/4A, alongside earlier movement, drawing and keyboard improvements. All five systems build directly on Windows or Mac.
AGI-ANTIC minimum requirements:Atari XL/XE with at least 64K RAM, or an Atari 800 with an Incognito board or similar upgrade. King’s Quest II, Police Quest and Space Quest II require a MegaMax 2 MB cartridge.
Other Games includes native C64 versions of Another World and M.U.L.E.+. Free download: no original commercial game files are included, so supply your own copies. M.U.L.E.+ is bundled.
Check game editions and system requirements. Full-game and real-hardware testing of the three Highly Experimental systems remain open.
Mean Hamster Power Engine for 8-Bits
TeensyROM+ · Kung Fu Flash 2 · A8PicoCart · A8PicoDuo (Windows) · Windows or Mac · Windows v2.1.8
Team up your C64 or Atari XL/XE with a supported cartridge’s processor. The Windows or Mac app prepares matching firmware, supported games and emulators, and an optional HamsterOS for MPE desktop.
Prepare on Windows or Mac, then play on the classic computer without the preparation computer connected. Installing cartridge firmware is a separate step from preparing the SD card.
Free, exclusively from Mean Hamster. Supply your original game files and compatible ROMs; commercial games are not included.
HamsterWeazle
Current Windows release: v1.5.10
Windows
HamsterWeazle-Windows.exe
Windows 10/11 x64 with .NET 10 Desktop Runtime required. Requires a GreaseWeazle USB adapter and floppy drive.
Download Windows buildMac
Apple Silicon and Intel
Apple Silicon v1.5.10 brings the Workbench interface to Mac and is signed and Apple-notarized. Intel v1.5.5 remains available. Both downloads include complete app bundles.
Apple Silicon v1.5.10 · Intel v1.5.5