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c64u - Commodore C64 Ultimate CLI

A command-line interface for controlling the Commodore C64 Ultimate via its REST API.

Features

  • Complete REST API Coverage: All C64 Ultimate API endpoints supported
  • Flexible Configuration: Config file, environment variables, or CLI flags
  • Multiple Output Formats: Human-readable text or JSON for scripting
  • Cross-Platform: Builds for macOS, Linux, and Windows
  • Easy Integration: Works seamlessly with c64.nvim, VSCode, and scripts

Installation

Download Pre-built Binaries (Recommended)

Download the latest release from GitHub Releases:

  • c64u_Darwin_x86_64.tar.gz - macOS (Intel)
  • c64u_Darwin_arm64.tar.gz - macOS (Apple Silicon)
  • c64u_Linux_x86_64.tar.gz - Linux (x86_64)
  • c64u_Linux_arm64.tar.gz - Linux (ARM64)
  • c64u_Windows_x86_64.tar.gz - Windows

Quick Install (macOS/Linux):

# Download and extract (replace with your platform)
curl -L https://github.com/cybersorcerer/c64u/releases/latest/download/c64u_Darwin_arm64.tar.gz | tar xz

# Move binary to PATH
sudo mv c64u /usr/local/bin/

# Verify installation
c64u version

Windows:

  1. Download c64u_Windows_x86_64.zip
  2. Extract c64u.exe
  3. Add the directory to your PATH

From Source

# Clone the repository (or navigate to the tools directory)
cd /path/to/c64u/tools/c64u

# Build and install
make install

This will install c64u to ~/bin or /usr/local/bin.

Manual Build

# Build for current platform
make build

# Binary will be in build/c64u
./build/c64u version

Cross-Platform Builds

The project uses GoReleaser for cross-platform builds:

# Build for all platforms (uses GoReleaser if installed, otherwise falls back to manual build)
make release

# Manual build for all platforms
make release-manual

# Binaries will be in dist/
# - macOS (Intel & Apple Silicon)
# - Linux (x86_64 & ARM64)
# - Windows (x86_64)

Install GoReleaser (optional):

# macOS
brew install goreleaser

# Or via Go
go install github.com/goreleaser/goreleaser@latest

Prerequisites

  • Go 1.22 or later (for building)
  • C64 Ultimate hardware on your network

Quick Start

1. Create Configuration File

c64u cli-config init

This creates ~/.config/c64u/config.toml with default settings.

2. Edit Configuration

Edit ~/.config/c64u/config.toml:

# C64 Ultimate hostname or IP address
host = "192.168.1.100"

# HTTP port (default: 80)
port = 80

3. Test Connection

# Get API version
c64u about

# Show current CLI configuration
c64u cli-config show

Configuration

Priority Order

  1. CLI Flags (highest priority)

    c64u --host 192.168.1.100 --port 80 about

  2. Environment Variables

    export C64U_HOST=192.168.1.100
export C64U_PORT=80
c64u about

  3. Config File ~/.config/c64u/config.toml

  4. Defaults

    • host: localhost
    • port: 80

Usage

Global Flags

--host string      C64 Ultimate hostname/IP (env: C64U_HOST)
--port int         HTTP port (default: 80) (env: C64U_PORT)
--json             Output in JSON format
--verbose          Enable verbose output (shows HTTP requests)

Commands

Version Information

# CLI tool version
c64u version

# C64 Ultimate API version
c64u about

# C64 Ultimate device information
c64u info

CLI Configuration Management

Manage c64u CLI tool configuration file (~/.config/c64u/config.toml):

# Create default CLI config file
c64u cli-config init

# Show current CLI configuration
c64u cli-config show

Runners - Media & Program Execution

# SID playback
c64u runners sidplay <file> [--song N]        # Play SID from C64U filesystem
c64u runners sidplay-upload <file> [--song N] # Upload and play SID

# MOD playback
c64u runners modplay <file>                    # Play MOD from C64U filesystem
c64u runners modplay-upload <file>             # Upload and play MOD

# PRG loading (no execution)
c64u runners load-prg <file>                   # Load PRG via DMA
c64u runners load-prg-upload <file>            # Upload and load PRG

# PRG loading and running
c64u runners run-prg <file>                    # Load and run PRG
c64u runners run-prg-upload <file>             # Upload and run PRG

# Cartridge
c64u runners run-crt <file>                    # Start cartridge
c64u runners run-crt-upload <file>             # Upload and start cartridge

Machine Control

# Control commands
c64u machine reset                             # Reset machine
c64u machine reboot                            # Reboot with cartridge reinit
c64u machine pause                             # Pause via DMA
c64u machine resume                            # Resume from pause
c64u machine poweroff                          # Power off (U64 only)
c64u machine menu-button                       # Simulate Menu button press

# Memory operations
c64u machine write-mem <addr> <data>           # Write hex data to memory
c64u machine write-mem-file <addr> <file>      # Write file to memory
c64u machine read-mem <addr> [--length N]      # Read memory (hex dump)

# Debug register (U64 only)
c64u machine debug-reg                         # Read debug register
c64u machine debug-reg-set <value>             # Write debug register

Drive Operations

# List and mount
c64u drives list                               # List all drives
c64u drives mount <drive> <image> [--type TYPE] [--mode MODE]
c64u drives mount-upload <drive> <file> [--type TYPE] [--mode MODE]
c64u drives unmount <drive>                    # Remove disk

# Control
c64u drives reset <drive>                      # Reset drive
c64u drives on <drive>                         # Enable drive
c64u drives off <drive>                        # Disable drive

# ROM and mode
c64u drives load-rom <drive> <file>            # Load custom ROM
c64u drives load-rom-upload <drive> <file>     # Upload and load ROM
c64u drives set-mode <drive> <mode>            # Set mode (1541/1571/1581)

Mount types: d64, g64, d71, g71, d81 Mount modes: readwrite, readonly, unlinked

Data Streams (U64 Only)

c64u streams start <stream> <ip>               # Start stream (video/audio/debug)
c64u streams stop <stream>                     # Stop stream

Streams: video (port 11000), audio (port 11001), debug (port 11002)

File Operations

# File information
c64u files info <path>                         # Get file info (supports wildcards)

# Create empty disk images on C64 Ultimate
c64u files create-d64 <path> [--tracks N] [--name NAME]
c64u files create-d71 <path> [--name NAME]
c64u files create-d81 <path> [--name NAME]
c64u files create-dnp <path> --tracks N [--name NAME]

# Pack local directory into disk image (EXPERIMENTAL)
c64u files pack-d64 <source-dir> <output-file> [--name NAME] [--id ID] [--tracks N]

# Upload to C64 Ultimate
c64u fs upload <local-file> <remote-path>

⚠️ EXPERIMENTAL FEATURE: The pack-d64 command is experimental. While basic functionality works, there may be edge cases or compatibility issues with certain files or disk configurations. Always test generated disk images before relying on them.

Pack D64 Examples:

# Create D64 from directory
c64u files pack-d64 ./myproject game.d64 --name "MY GAME" --id "01"

# Create 40-track D64
c64u files pack-d64 ./build output.d64 --tracks 40 --name "BIG DISK"

# Use directory name as disk name
c64u files pack-d64 ./demo-files demo.d64

# Create and upload to C64 Ultimate
c64u files pack-d64 ./myproject game.d64 && c64u fs upload game.d64 /SD/games/game.d64

Supported file types: .prg, .seq, .usr, .rel (and their P00/S00/U00/R00 variants)

Filesystem Operations (via FTP)

Complete filesystem access to C64 Ultimate via FTP (port 21, anonymous login):

# Directory listing
c64u fs ls [path]                              # List files and directories

# File transfer
c64u fs upload <local> <remote>                # Upload file to C64U
c64u fs download <remote> <local>              # Download file from C64U

# Directory operations
c64u fs mkdir <path>                           # Create directory
c64u fs rm <path>                              # Remove file or directory

# File operations
c64u fs mv <source> <dest>                     # Move/rename file or directory
c64u fs cp <source> <dest>                     # Copy file (download+upload)
c64u fs cat <path>                             # Show file information

Examples:

# List root directory
c64u fs ls /

# Upload PRG file
c64u fs upload myprogram.prg /Temp/myprogram.prg

# Download from SD card
c64u fs download /SD/games/game.prg ./game.prg

# Create directory
c64u fs mkdir /Temp/myproject

# Move file
c64u fs mv /Temp/old.prg /Temp/new.prg

Configuration Management

Manage C64 Ultimate configuration settings:

# List all categories
c64u config list

# Show all settings in a category
c64u config show "Drive A Settings"
c64u config show "drive a*"              # Wildcards supported

# Get detailed info about a setting
c64u config get "Drive A Settings" "Drive Type"
c64u config get "drive a*" "*bus*"       # Wildcards supported

# Set a configuration item
c64u config set "Drive A Settings" "Drive Type" "1581"
c64u config set "drive a*" "*bus*" "9"

# Set multiple settings from JSON file
c64u config set-multiple settings.json

# Persistence
c64u config save-to-flash                # Save to non-volatile memory
c64u config load-from-flash              # Load from flash (discards unsaved changes)
c64u config reset-to-default             # Reset to factory defaults

# Export/Import
c64u config export config-backup.json    # Export all settings to JSON
c64u config export                       # Print to stdout

JSON format for set-multiple:

{
  "Drive A Settings": {
    "Drive": "Enabled",
    "Drive Type": "1581"
  },
  "Drive B Settings": {
    "Drive": "Disabled"
  }
}

Output Formats

Text Mode (Default)

Human-readable output:

$ c64u about
C64 Ultimate API version: 0.1

JSON Mode

Machine-readable output for scripting:

$ c64u --json about
{
  "version": "0.1"
}

Verbose Mode

Shows HTTP requests and responses:

$ c64u --verbose about
→ GET http://192.168.1.100:80/v1/version
← 200 200 OK
  Response: {
  "version" : "0.1",
  "errors" : [  ]
}
C64 Ultimate API version: 0.1

Integration

With c64.nvim

The c64u CLI integrates seamlessly with the c64.nvim plugin:

-- In your c64.nvim config
require("c64").setup({
  c64u = {
    enabled = true,
    host = "192.168.1.100",
    port = 80,
  }
})

-- Use <leader>ku to upload and run on C64 Ultimate

With Shell Scripts

#!/bin/bash
# Assemble and run on C64 Ultimate

# Assemble
java -jar kickass.jar -o program.prg program.asm

# Upload and run
c64u runners run-prg-upload program.prg

With VSCode

(Coming soon - VSCode extension in development)

Development

Project Structure

c64u/
├── cmd/c64u/          # Main application entry point
├── internal/
│   ├── api/           # REST API client
│   ├── config/        # Configuration handling
│   └── output/        # Output formatting
├── go.mod             # Go module definition
├── Makefile           # Build automation
└── README.md          # This file

Building

# Development build
make dev

# Run tests
make test

# Run with coverage
make test-coverage

# Format code
make fmt

# Run linter (requires golangci-lint)
make lint

Adding New Commands

Commands are organized by API category. See the implementation plan for details.

Releasing

For maintainers: To create a new release:

# Tag the release
git tag -a v0.4.0 -m "Release v0.4.0"
git push origin v0.4.0

# The GitHub Action will automatically:
# 1. Build binaries for all platforms
# 2. Create a GitHub release
# 3. Upload all binaries and checksums

Or manually with GoReleaser:

# Ensure GITHUB_TOKEN is set
export GITHUB_TOKEN=your_github_token

# Create release
make release-publish

API Reference

The C64 Ultimate REST API documentation is available at: https://1541u-documentation.readthedocs.io/en/latest/api/api_calls.html

Troubleshooting

Connection Issues

# Test if C64 Ultimate is reachable
ping 192.168.1.100

# Test HTTP connection
curl http://192.168.1.100/v1/version

# Use verbose mode to see HTTP details
c64u --verbose --host 192.168.1.100 api-version

Configuration Issues

# Check current CLI configuration
c64u cli-config show

# Verify config file location
ls -la ~/.config/c64u/config.toml

# Override with environment variables
C64U_HOST=192.168.1.100 c64u api-version

License

Apache 2.0

Credits

Contributing

Contributions are welcome! Please feel free to submit issues or pull requests.

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CLI for the new Commodore C64 Ultimate

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Readme

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Apache-2.0 license
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c64u 0.5.2 Latest
Feb 7, 2026
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