NSFDRV

NSFDRV is to Include the information of sound driver to NSF.

Background

A some old sound driver for chiptune has bug as follows.

• In N163 audio, length of waveform is not set correctly.
• FDC audio is not enable.

NSFDRV is to slove this problem.

• NSF Player can detect sound driver, and can fix the bug of old sound driver such as mck.
• User can assert that user's NSF is original easily. (NSF is not ripped data from rom.)
• If occur BUG in sound driver, Developer can get information of version number from NSF file for the debug.

File Format

There is 8 bytes information of sound driver after NSF header. This 8 bytes information is on actual rom image of 6502.

offset  # of bytes   Function
----------------------------
$0000 - $007F        NSF Header (128byte)
$0080 - $0085        Name of sound driver (ASCII)
$0086                Version integral number
$0087                Version integral number

List of sound driver

• 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 (http://shaw.la.coocan.jp/nsdl/)

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

• Development code (for no-bug sound driver)

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

Old chiptune sound driver have some bugs. Some NSF Player adjust this bug of old chiptune sound driver. But, It adjuster affect the new sound driver without bug. Therefore, this information is need now.

NSF Player detect the sound driver name. If sound driver have not bug, then adjuster is disable. If sound driver is unknown (old sound driver), then adjuster is enable.