Sonic_knuckles_wsonic3.bin [2021] ❲Latest — RELEASE❳

This .bin file is a binary copy of the combined Sonic 3 and Sonic & Knuckles cartridges. Originally, these were two separate games that could be "locked" together using Sega's unique Lock-on Technology. In the digital world, this combined data is stored as a single ROM file.

| Offset (relative) | Length | Description | |-------------------|--------|-------------| | 0x0000 | 0x4000 (16 KiB) | – runs at reset, remaps address lines, copies a small bootstrap to RAM. | | 0x4000 | 0x1FC000 (≈2 MiB‑64 KiB) | W‑Sonic‑3 program – the custom code that replaces Sonic & Knuckles’ “extension”. | | 0x200000‑0x2003FF | 0x400 (1 KiB) | Lock‑On metadata – a 4‑byte “magic” (0x534B4E44 = “SKND”) followed by version, checksum, and author tag. | | 0x200400‑0x3FFFFF | remainder | Padding (0xFF) – unused space required to reach 4 MiB. | sonic_knuckles_wsonic3.bin