Phosphor

A SID music player for USBSID-Pico hardware, software emulation, and Commodore Ultimate 64 network playback. Built with Rust and Iced.

Downloads

Prebuilt binaries for macOS, Linux and Windows are available on the GitHub Releases page:

https://github.com/sandlbn/Phosphor/releases

Features

• Four playback engines — USB hardware, software emulation (reSID or SIDLite), or Commodore Ultimate 64 over the network
• Playlist management — add files and folders, drag & drop, save/load M3U playlists
• Sortable columns — click any column header to sort by title, author, released, duration, type, or SID count
• Search & filter — real-time search across title, author, released year, and file path
• Favorites — heart any tune; filter playlist to favorites only
• Recently played — persistent history of the last 100 unique tracks with human-readable timestamps
• HVSC Songlength DB — automatic song-length lookup with configurable fallback duration
• HVSC STIL — song info overlay (cover titles, original artists, composer comments) via the ⓘ button; downloaded or loaded from a local STIL.txt
• Multi-SID support — PSID/RSID, 1SID/2SID/3SID tunes, PAL/NTSC
• Sub-tune navigation — step through all sub-tunes within a SID file
• SID register panel — real-time scrolling tracker view (note, waveform, ADSR per voice) plus live register readout for all active SID chips
• U64 audio streaming — stream SID audio from the Ultimate 64 back to the host machine over UDP
• Keyboard shortcuts — full keyboard control (see below)
• Window geometry — size and position are remembered between sessions
• HVSC completion tracking — persistent log of every unique SID heard; status bar shows your progress against the full HVSC collection (e.g. 42 of 50127 HVSC SIDs heard (0.08%))

Keyboard Shortcuts

Keyboard Shortcuts

Key	Action
Space	Play / Pause
←	Previous track
→	Next track
↑	Select previous track in playlist
↓	Select next track in playlist
F	Toggle full-screen visualiser
V	Cycle visualiser mode (Bars → Scope → Tracker)
H	Toggle favourite for currently playing track
?	Show keyboard shortcuts & about
Delete	Remove selected track
Ctrl+F	Focus search
Escape	Close overlay / exit full-screen

Playback Engines

Selectable in Settings (⚙):

• Auto — tries USB first, falls back to software emulation
• USB — USBSID-Pico hardware via register-level writes
• Emulated (reSID) — software SID via resid-rs + cpal audio output
• SIDLite (libsidplayfp) — lightweight SID emulation from libsidplayfp + cpal audio output
• Ultimate 64 — native playback on Ultimate 64 / Elite II via REST API (firmware 3.14+ required)

Requirements

• Rust toolchain (cargo)
• SID files (e.g. from HVSC)
• One or more of: USBSID-Pico device, audio output (for emulation), or Commodore Ultimate 64 / Elite / Ultimate-II+ on the network

Install

macOS

The bridge daemon runs as root via launchd to handle USB access:

chmod +x install.sh
./install.sh

This builds Phosphor and the bridge daemon, installs the LaunchDaemon, and starts it. Run with:

./target/release/phosphor

To uninstall the daemon:

sudo launchctl unload /Library/LaunchDaemons/com.phosphor.usbsid-bridge.plist
sudo rm /usr/local/bin/usbsid-bridge
sudo rm /Library/LaunchDaemons/com.phosphor.usbsid-bridge.plist

Windows

1. Install the WinUSB driver for your USBSID-Pico using Zadig
2. Build and run:

cargo build --release
./target/release/phosphor.exe

Linux

1. Add a udev rule for the USBSID-Pico (VID cafe):

echo 'SUBSYSTEM=="usb", ATTR{idVendor}=="cafe", MODE="0666"' | sudo tee /etc/udev/rules.d/99-usbsid.rules
sudo udevadm control --reload-rules

2. Build and run:

cargo build --release
./target/release/phosphor

Configuration

Phosphor stores its configuration in:

Platform	Path
macOS	~/Library/Application Support/phosphor/
Linux	~/.config/phosphor/
Windows	%APPDATA%\phosphor\

Files stored there:

File	Contents
config.json	Settings, window geometry, last-used directories
favorites.txt	Favorited tune MD5 hashes (one per line)
recently_played.json	Last 100 played tracks with timestamps
Songlengths.md5	Cached HVSC Songlength database
STIL.txt	Cached HVSC SID Tune Information List
heard.txt	MD5 hashes of every SID ever played (one per line)

HVSC Integration

Phosphor can load two HVSC databases from Settings (⚙):

Songlength DB — provides accurate per-subtune durations so tracks advance automatically at the right time. Download directly from the HVSC CDN or point to a local Songlengths.md5 file.

STIL — the SID Tune Information List maps each SID file to the original songs it covers, the performing artists, and curator comments. Once loaded, a ⓘ button appears next to the ♥ heart whenever info is available for the current tune. Click it to show the overlay; click the backdrop or ✕ to dismiss.

For the most accurate STIL lookups, set the HVSC root directory in Settings to the root of your local HVSC tree (e.g. /home/user/C64Music). Without it Phosphor falls back to matching by filename, which works for most collections but can be ambiguous when multiple composers share a filename.

U64 Audio Streaming

When using the Ultimate 64 engine, Phosphor can stream the C64's audio output back to the host machine so you can hear playback through your computer speakers.

Enable it in Settings (⚙) under U64 audio streaming. Set the UDP port (default 11001) to any free port above 1024.

When a tune starts playing, Phosphor sends a REST command to the U64 asking it to stream audio as UDP unicast packets to your machine's IP on the configured port. A local receiver resamples from the C64's native PAL/NTSC clock rate to your audio device's sample rate and plays through your default output device with a short jitter buffer to absorb network timing variation.

Requires Ultimate 64 firmware 3.14 or later. Earlier firmware versions had a bug in the audio streaming API. A wired network connection to U64 machine is required.