TGB Dual - RetroBIOS¶
| Type | libretro |
| Source | https://github.com/libretro/tgbdual-libretro |
| Version | v0.8.3 |
| Profiled | 2026-03-18 |
| Cores | TGB Dual |
| Systems | nintendo-gb, nintendo-gbc |
No BIOS or firmware files required. This core is self-contained.
TGB Dual is a Game Boy / Game Boy Color emulator by GIGO and Hii with link cable support for two Game Boy units side by side.
No BIOS or boot ROM files are required or supported. The core does not call RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY for firmware loading and does not attempt to open any files from the system directory.
In cpu.cpp:57, the program counter is initialized to 0x100 (post-boot ROM entry point), and cpu::reset() sets all registers to their post-boot values directly (AF=0x01B0 for DMG, 0x11B0 for CGB). This means the core completely bypasses the boot ROM sequence via HLE register setup.
The load_rom() path in libretro.cpp passes ROM data directly to the gb class without any BIOS file concatenation or boot ROM mapping.
Supported extensions: gb, dmg, gbc, cgb, sgb. Library version: v0.8.3.
Generated on 2026-03-20T19:12:20Z