paulb_nl on the Shmups forums has released his own custom firmware for the OSSC that ads special modes to help with Game Boy Interface Compatibility. Here are some options:
- Line2x 240×360 and Line3x 240×360 are added to 384p Proc menu.
- Line2x 240×360 outputs 1200×720 with default settings.
- Use these settings for 1280×720: H.active 256, H backporch: 24, Hsynclen: 18.