This is a format for compressing game code and other misc data in the ROM. There are 4 OVLN blocks in Supercross 2000.
This format uses EAHD for the compression, which starts at offset 0x10 of the OVLN block.
The OVLN header takes up the first 0x10 bytes of the compressed file. After the header is a EAHD compressed block.
| Offset | #Bytes | Description |
|---|---|---|
| 0x00 | 4 | “OVLN” |
| 0x04 | 4 | Compressed size (including the header) |
| 0x08 | 4 | RAM location to decompress |
| 0x0C | 4 | RAM location to JAL to when done |