What's new

jgb v0.10.5 is released.

jgb is a cross-platform low-level Game Boy [Color] emulator with no game-specific logic or game-specific hacks. It is not completely cycle-accurate due to CPU emulation being instruction-based rather than cycle-based, but it should be able to run the vast majority of licensed Game Boy and Game Boy Color games.


Game Boy and Game Boy Color emulation
Support for cartridges using MBC1, MBC2, MBC3, MBC5, MBC7 mappers
Save file / cartridge RAM persistence to disk
Keyboard input and DirectInput gamepad support
Support for the MBC3 real-time clock with persistence to disk
Support for MBC5 rumble cartridges (requires a gamepad with rumble)
Support for the MBC7 accelerometer (requires a gamepad with an accelerometer)
2x fast-forward toggle
Save & load state
Three different color palette options for GB mode (black & white, light green tint, intense lime green)
Option for GBC color correction to more closely mimic how games looked on the Game Boy Color LCD
Option for integer scaling regardless of window/display size


Fix Resident Evil Gaiden from crashing the emulator after the title screen; this game intentionally underflows the program counter using a relative jump instruction, which previously caused the emulator to terminate with an error. It will now "gracefully" wrap around from $0000 to $FFFF (and vice versa)