DPS

The document is based on source code of DPS patcher by Marc de Falco

DPS File Format

Header

• 64 bytes: name of the patch

• 64 bytes: author of the patch

• 64 bytes: version of the patch

• 1 byte: patch flag (1 if the patch unstable)

• 1 byte: dps version

• 4 bytes: the size of the original rom

• ? bytes: DATA (repeated until the end of file)

DATA

• 1 byte: mode [0 or 1]

• 4 bytes: offset in the output rom

• ? bytes: CHUNK

CHUNK (if mode == 1)

• 4 bytes: length X

• X bytes: data

If mode == 1, the data is copied from the original rom to the output rom.

CHUNK (if mode == 0)

• 4 bytes: offset in the input rom

• 4 bytes: length

If mode == 0, the data is copied from the patch file to the output rom.