SFDN Packer

SFDN Packer (Shannon-Fano Differential Nybble Packer) is a file compression utility, and associated format, for Atari 8-bit computers. It was developed by Sebastian "Seban" Igielski, in association with something called Slight. It's used mainly for audio and graphics files.

Identification
Files made by SFDN Packer 1.01 start with ASCII "".

Sample files

 * RECOIL → examples.zip → {AGA2.HPS, ASSASSIN.INS, CHRISTA.APP, LASKA.PLS, LEZANKA.ILS, NINJA.APP, redrose.aps, ROSE.APP, SHPOON.G9S, SHPOON.SFD}

Software

 * SFDN Packer 1.01: ,
 * RECOIL - Can decompress the format internally (recoil.ci, look for "SfdnStream").

Links

 * Atariki: SFDN Packer (in Polish)