OpenComputers II
by Sangar
OpenComputers II adds programmable computers and robots that run emulated RISC-V or Z80 processors, with Linux and CP/M available as operating systems.
What it does
Computers in OpenComputers II are either stationary machines or mobile robots. Each one runs an emulated CPU, either RISC-V or Z80, and the Linux system on RISC-V or CP/M on Z80 is what players interact with. Computers and robots draw energy in RF/FE, and the mod pairs with other energy-generating mods to supply it. Computers can be configured through device items, and the device types they share include memory, RAM, firmware and hard drives.
The mod is a spiritual successor to OpenComputers and carries over some of its core ideas, such as configurability and sandboxing, while replacing much of the original with emulated hardware. Required dependencies are Architectury API, Fabric API, Forge Config API Port and Markdown Manual. ComputerCraft and TIS-3D are optional. The mod is open source under the MIT License and published for 1.21.1 on Fabric and NeoForge, with files dated 2026-10-07. Snapshot builds are not part of this listing.
Key features
Emulated RISC-V and Z80 CPUs
Computers run either a RISC-V or a Z80 processor installed as a CPU item, with Linux and CP/M as the systems on top.
Networking with ethernet frames
Computers exchange data through an emulated network card that sends regular ethernet frames to other Linux machines.
Devices connected by bus cables
Computers link to in-world devices with bus cables and extension cards, while robots move through the world and interact through installed modules.
Built-in Lua and Python scripting
Lua and Python are included for scripting, and a high-level API reaches Minecraft devices such as inventories and the Redstone Interface Block.
In-game Computerists Handbook
The Computerists Handbook is a craftable manual item with information blocks on building a first computer and a read-online version.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 4
Questions
Does OpenComputers II need Architectury API?
Does the server need the mod installed?
Is ComputerCraft needed to use OpenComputers II?
Which operating systems can computers run?
In the catalog
OpenComputers II is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 32,366 mods support Minecraft 1.21.1.
More from Sangar
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What the author says
OpenComputers II is a spiritual successor to OpenComputers. It carries some of the core ideas with it, such as configurability and sandboxing. However, there are also many changes, such as the mod using actual, emulated hardware. Computers in this mod run on either a RISC-V or a Z80 architecture, based on the…
Official listing
- Modrinth page
- modrinth.com/mod/opencomputers-ii
- Owner
- Sangar
- Published
- 2026-09-03
- Updated on Modrinth
- 2026-10-07
- Facts verified
- 2026-10-15