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Sound Header
Developer: BDC of Aura crew
Header: Custom
Content: Programmatic
Instruments: Combined
Target Output
Output - Digital Audio - No.png Output - MIDI - No.png Output - FM Synthesis - No.png Output - PSG.png
Released: 1997
First Game: N/A
  • *.sndh

The SNDH format, like SID or NSF, contains the machine code instructions for creating the sound effects and music for an Atari ST program. The Atari ST used a YM2149 PSG chip for music and sound.





SNDH to ?

? to SNDH



All games released for the Atari ST can have their soundtrack ripped to SNDH format. ZX Spectrum 128, Amstrad CPC or MSX tracks can be dumped into it also, but this way is uneffective since there are already AY, KSS and YM formats, which you can play through real machine, while SNDH can't anywhere but Atari ST.


Most of the Atari ST games have SNDH or SC68 rip. Here is the list of known games without known music rip (even in SC68 format):

How to Obtain

Ripping SNDH files requires an intimate knowledge of the Atari ST hardware, but luckily, several popular Atari ST games already have their sound ripped to SNDH format and can be downloaded here:

  • - SNDH Archive (note that game music is intermixed with stand-alone and demo songs).


Most SNDH files are compressed using Pack-Ice and accordingly start with "ICE!".

An uncompressed SNDH file begins with three 4-byte 68000 instructions (usually long branches) to respectively initialize the driver with a specific subtune, exit the driver and play the next tick, then the actual signature "SNDH", any number of tags terminated with the signature backwards ("HDNS"), and finally the actual driver code and data.