'[#[Summary]
NSF is the sound file format for the Ricoh 2A03 chip used in the Nintendo NES/Famicom game console.  The NSF filetype also supports additional sound expansion chips.

The 2A03 has five sound channels: two pulse waves, one triangle, one noise, and one DPCM channel.

'[#[Rules]
At BotB, expansions are only allowed in the "'[[nsfplus (format)[nsfplus]" format.  The nsf format is for 2A03 '[b]only'[/b]. A common beginner's mistake is to submit a FTM (FamiTracker Module) to a NSF compo instead of an NSF file (don't do this).

'[#[Tools]
'[[FamiTracker] (by far the most popular tool for this format)
'[[PPMCK]
'[[it2nsf]
'[[DefleMask Tracker]
'[[NerdTracker II]
'[[NTRQ]
'[[NesTracker]
'[[s3m2nsf]