FrodoRGB

FrodoRGB is the Future Retro Fusion AmigaOS 68k RGB/RTG development branch of Frodo V4.1b, the Commodore 64 emulator originally written by Christian Bauer.

Current staged FRF edition: v1.0.27

Future Retro Fusion Amiga work

• CyberGraphX true-colour RTG output and indexed fallback
• fixed C64 RGB palette conversion and RTG colour lookup
• selectable RTG/native RGB fullscreen handling
• AHI pause, focus and multi-instance lifecycle fixes
• raw AmigaDOS startup argument handling
• CRT, PRG, D64, T64, snapshot and REU launch support
• EasyFlash, 8K/16K, Ultimax and Magic Desk cartridge work
• VIC sprite-multiplexer correction work
• native PAL320 / MagiC64-style line presentation
• dedicated FrodoRGB performance executable
• direct-PC and line-level CIA FrodoRGB hot path
• non-blocking native RGB screen-buffer swaps

Command line and configuration

A complete reference for the current AmigaOS command-line parser, startup-output switches, media options, REU overrides, display/test switches, saved Frodo Prefs keys, defaults and MultiCPU build profiles is here:

COMMAND_LINE_AND_CONFIG.md

The reference includes cartridge/CRT, PRG/D64/T64, snapshots, REU sizes, FULLSCREEN=, SCREENMODE, windowed/RTG/RGB output selection, scaling, VSync, PAL320/RGB320, PLANAR16, DISPLAYEVERY=, NODISPLAY, all persisted preference keys, and the 020/040/060 soft- and hard-float build variants.

Note: the current main_Amiga.i startup guard still requires 68040 + 68881 or higher. The MultiCPU guide calls this out explicitly because the lower-CPU/no-FPU builds need that runtime guard made variant-aware before they can be considered fully supported targets.

Build

make -f Makefile.PiStorm060 clean
make -f Makefile.PiStorm060 -j2 FrodoRGB

The normal fast Frodo target remains available alongside FrodoRGB.

MultiCPU binaries

The MultiCPU release line provides clean independent builds for:

• FrodoRGB_020
• FrodoRGB_020_FPU
• FrodoRGB_040
• FrodoRGB_040_FPU
• FrodoRGB_060
• FrodoRGB_060_FPU

See COMMAND_LINE_AND_CONFIG.md for the exact -m680xx and soft/hard-float profiles.

Verification

./scripts/verify-repo.sh

ROMs and media

No Commodore 64 system ROMs or commercial game media are included.

Attribution

• Original Frodo emulator: Christian Bauer
• RGB / RTG / AmigaOS integration and FRF 2026 modifications: Future Retro Fusion

Future Retro Fusion does not claim authorship of the original Frodo core.

Licensing

See COPYING and the repository licensing files. COPYING is the authoritative GPLv2 text.