To represent them, we use the hypothetical functions read(addr) (reads a byte) and readw(addr) (reads a word), where addr can be either a PC or SNES address. Its corresponding PC address depends on the map mode used by a ROM.

using a hex editor.Īn SNES address is what the SNES uses for accessing data in different parts of its memory. You will use them to access a specific byte of the ROM e.g. PC addresses are just indices of bytes contained inside of a ROM file.

SNES addresses: dollar sign $, for example $08D9F9.

PC addresses: pound sign £, for example £007FC0.

Units of dataĪddresses are base 16 numbers prefixed with currency symbols: Text stringsĪSCII strings are enclosed between a pair of quotation marks, for example 'Hello World'.

Decimal numbers (base 10) have no suffix, for example 42ĭigits in numbers may sometimes be divided by _ for increased readability, for example 1_234_567.

Hexadecimal numbers (base 16) are suffixed with subscript 16, for example DEADC0DE 16.

Binary numbers (base 2) are suffixed with subscript 2, for example 11010100 2.

Number literalsĪll number values that are not addresses may have a base prefix: In order to avoid confusion, the following sections explain how all kinds data are notated in this documentation, and what certain terms used here mean. Here you can learn more about the SNES memory map. The address mapping of Super Mario World is LoROM. Some ROMs have 512 B of empty data at the beginning of the file: this is called the SMC header, it’s simply ignored. Super Mario World ROM is exactly 512 kB large. This site is intended for thorough documentation of data within the Super Mario World ROM, listing exact locations of everything and explaining the data formats.Ĭontent posted here will be added incrementally as we learn about the ROM during development of the SMW Editor.

Mario world level editor rom