A proper merged ROM is not simply 4MB + 4MB = 8MB. Due to shared assets and bank switching, a working file is typically 6,291,456 bytes (6 MB exactly).
The file sonicknuckleswsonic3bin refers to a standard binary dump of the Sega Genesis/Mega Drive cartridge duo Sonic the Hedgehog 3 and Sonic & Knuckles . Unlike standard standalone ROMs, this file represents a "Locked-On" state, combining two separate 2MB ROMs into a single 4MB address space. This report outlines the file structure, the technical implementation of the "Lock-On" technology, and the resulting gameplay alterations. sonicknuckleswsonic3bin file work