NuFX

File Format
Name	NuFX
Ontology	Electronic File Formats Archiving NuFX
Extension(s)	.shk, .sdk, .bxy
Wikidata ID	Q25305144, Q29167432, Q60558754
Released	1989

NuFX (also known as ShrinkIt format) was an archiving format used for the Apple II series late in its history, created by Andy Nicholas as a student project at Moravian College in Bethlehem, Pennsylvania. The ShrinkIt program (also created by Nicholas) supported it. It usually uses LZW compression.

When NuFX-format data was placed into Binary II format for transfer, the file extension .bxy was used.

Identification

NuFX files start with bytes 4e f5 46 e9 6c e5. This is ASCII "NuFile", but with the high bit set on alternate bytes.

Specifications

• Apple II File Type Notes - ShrinkIt / NuFX
• ARCHIVE FORMATS AND DATA, by Raymond Clay, "NuFX - SHRINKIT" section

Software

• NuLib, NuLib2, NufxLib
• NuLib v3.24 (DOS software)
• Shink-Fit X - Mac OS X archiver compatible with ShrinkIt
• ShrinkIt

Sample files

• https://telparia.com/fileFormatSamples/archive/nuFX/
• FTP Site: UMICH Software Archive → .../*.shk

Links

• NuFX format described (A2-Central, Aug. 1989)
• Hacking data compression (gives lots of format details)
• What are ShrinkIt files?