NSFDRV

NSFDRV is an 8-byte header ID in the ROM of an NSF file used to identify the sound driver used.

• NSF players can use this ID to identify old sound drivers developed with inaccurate emulation, and therefore patch the drivers accordingly.

• Authors can assert that their NSF is original (i.e. NSF is not ripped from a ROM).

• In sound driver bug reporting, the developer can use this ID to identify the driver version.

The tag consists of 8 bytes on the actual program data of the NSF file.

Since the program data follows immediately after the NSF header, these 8 bytes are defined as follows:

Offset          Bytes   Function
-------------------------------------------------
$0000 - $007F   128     NSF Header
$0080 - $0085   6       Sound driver ID
$0086           1       Major version number
$0087           1       Minor version number

• OFGS (http://offgao.no-ip.org/ofgs/)

ASCII  :      "OFGS  "
Binary :      $4F $46 $47 $53 $20 $20

• FamiTracker NSF Driver (http://www.famitracker.com)

ASCII  :      "FTDRV "
Binary :      $46 $54 $44 $52 $56 $20

• NES Sound Driver & Library (https://github.com/Shaw02/nsdlib)

ASCII  :      "NSDL  "
Binary :      $4E $53 $44 $4C $20 $20

A blank NSFDRV ID may be used for sound drivers under development.

ASCII  :      "      "
Binary :      $20 $20 $20 $20 $20 $20

The following players implement NSFDRV identification:

• TNS-HFC4
• hoot

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