Nintendo Sound Format

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  • Extension: nsf

NSF files contain music playback programs extracted from Nintendo Entertainment System (NES) games.

Header

As given in the official specification:

offset  # of bytes   Function
----------------------------

0000    5   STRING  "NESM",01Ah  ; denotes an NES sound format file
0005    1   BYTE    Version number (currently 01h)
0006    1   BYTE    Total songs   (1=1 song, 2=2 songs, etc)
0007    1   BYTE    Starting song (1= 1st song, 2=2nd song, etc)
0008    2   WORD    (lo/hi) load address of data (8000-FFFF)
000a    2   WORD    (lo/hi) init address of data (8000-FFFF)
000c    2   WORD    (lo/hi) play address of data (8000-FFFF)
000e    32  STRING  The name of the song, null terminated
002e    32  STRING  The artist, if known, null terminated
004e    32  STRING  The Copyright holder, null terminated
006e    2   WORD    (lo/hi) speed, in 1/1000000th sec ticks, NTSC (see text)
0070    8   BYTE    Bankswitch Init Values (see text, and FDS section)
0078    2   WORD    (lo/hi) speed, in 1/1000000th sec ticks, PAL (see text)
007a    1   BYTE    PAL/NTSC bits:
                 bit 0: if clear, this is an NTSC tune
                 bit 0: if set, this is a PAL tune
                 bit 1: if set, this is a dual PAL/NTSC tune
                 bits 2-7: not used. they *must* be 0
007b    1   BYTE    Extra Sound Chip Support
                 bit 0: if set, this song uses VRCVI
                 bit 1: if set, this song uses VRCVII
                 bit 2: if set, this song uses FDS Sound
                 bit 3: if set, this song uses MMC5 audio
                 bit 4: if set, this song uses Namco 106
                 bit 5: if set, this song uses Sunsoft FME-07
                 bits 6,7: future expansion: they *must* be 0
007c    4   ----    4 extra bytes for expansion (must be 00h)
0080    nnn ----    The music program/data follows

Note that only the Namco 163 has a sound expansion, not the (very similar) Namco 106 as noted.

External links

TODO: this isn't actually a "music pattern format" - it's an executable one.