Highly Performant & Scalable Ultima Online Server Emulator
https://www.modernuo.com
c-sharpcsharpcsharp-coredotnetdotnet-coreemulatorgplgplv3mmommo-enginemmorpgmmorpg-serveronlinerpgrunuoserverservuoultimaultima-onlineuo
5df8d0bdae
Move the engine's own first-boot prompts (data directories, listeners, server
name, expansion + map selection) out of ServerConfiguration.Load and into
ServerConfiguration.ConfigurePrompts() [CallPriority(0)], so all first-boot
prompting -- engine and content -- runs through the single
AssemblyHandler.Invoke("ConfigurePrompts") phase. Load now only reads/creates
the config file.
- Feasible because assembly loading uses AssemblyDirectories (default
./Assemblies), not DataDirectories, so assemblies load before the now-later
data-dir prompt.
- UOClient.Load() (client-file discovery) moves with the data-dir prompt.
- Core.Expansion is now assigned in ConfigurePrompts (every non-mocked boot);
nothing between LoadAssemblies and that phase reads it (type initializers run
lazily, not at load).
- CallPriority(0) keeps engine prompts (incl. map selection) ahead of content
prompts like the pathfinding pre-bake (priority 50).
Main.cs already invokes the ConfigurePrompts phase, so no startup-ordering edit.
Tests are unaffected: fixtures call Load(true), which now just reads config, and
set expansion/data dirs directly; ConfigurePrompts is gated on m_Mocked.
Updates dev-docs/server-lifecycle.md to reflect the unified design.
NOTE: Main.cs startup ordering isn't covered by the fixture-based test suite, so
this needs a first-boot runtime check (fresh modernuo.json) before merge.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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| .github | ||
| dev-docs | ||
| Distribution/Data | ||
| Projects | ||
| .cursorrules | ||
| .editorconfig | ||
| .gitattributes | ||
| .gitignore | ||
| AGENTS.md | ||
| azure-pipelines.yml | ||
| CLAUDE.md | ||
| CODE_OF_CONDUCT.md | ||
| CONTRIBUTING.md | ||
| Directory.Build.props | ||
| FAQ.md | ||
| GEMINI.md | ||
| global.json | ||
| LICENSE | ||
| ModernUO.slnx | ||
| publish.cmd | ||
| publish.ps1 | ||
| publish.sh | ||
| README.md | ||
| rider-settings.zip | ||
| Rules.ruleset | ||
| SPONSORS.md | ||
| stylecop.json | ||
| THIRD-PARTY-NOTICES | ||
| version.json | ||
ModernUO 
Ultima Online Server Emulator for the modern era!
Requirements
Supported Operating Systems
Required Frameworks
All Operating Systems
Windows
Development
Supported IDEs
Getting Started
- Install prerequisite requirements
- Clone this repository (or download the latest):
git clone https://github.com/modernuo/ModernUO.git
- Open
ModernUO.slnto start developing
Building/Publishing
Interactive Mode (Recommended for new users)
Run ./publish.cmd (Windows) or ./publish.sh (Linux/macOS) with no arguments to launch the guided build tool. It will:
- Check prerequisites (.NET SDK, native libraries)
- Walk you through configuration and platform selection
- Build and publish the server to the
Distributiondirectory - Show deployment instructions for cross-compiled builds
Command Line
./publish.cmd [release|debug] [os] [arch]
os- Supported operating systemsarchx64- Intel/AMD 64-bitarm64- ARM 64-bit
Linux Prerequisites
Fedora, CentOS, RHEL, etc
dnf upgrade --refresh -y
# CentOS does not come with EPEL enabled
dnf install -y epel-release epel-next-release
dnf install -y findutils libicu libdeflate-devel zstd libargon2-devel liburing-devel
Ubuntu, Debian, etc
apt-get update -y
apt-get install -y libicu-dev libdeflate-dev zstd libargon2-dev liburing-dev
OSX Requirements
brew install icu4c libdeflate zstd argon2
Running the Server
- Follow the publish instructions
- The
Distributiondirectory is portable — copy it to your production server for deployment - Run
ModernUO.exeordotnet ModernUO.dllfrom theDistributiondirectory - On first run, the server will prompt you to configure game data file locations
Troubleshooting / FAQ
- See FAQ
Want to sponsor?
Thank you for supporting us! You can find out how by visiting the sponsors page.
Collaborators
Thanks
- RunUO Team & Community
- Voxpire, the ServUO Team & Community
- Karasho, Jaedan and the ClassicUO Community
Development Tools & Plugins provided with ♥ by
Code Signing Policy
Free code signing provided by SignPath.io, certificate by SignPath Foundation.
This program will not transfer any information to other networked systems unless specifically requested by the user or the person installing or operating it
Teams & Roles
Approvers & Committers: Development Team