exxos has released version 3.03 of nrvpack, a free online executable compression service for Atari ST PRG/APP/TOS/TTP files. Upload a file and get five compressed variants to choose from, each with different size/speed tradeoffs.
The packer and all 68000 decompression stubs were written from the ground up. Months of development went into the compression engine — including optimal parsing with dynamic programming, lit-cost sweeps, context-width tuning, and extensive testing of preprocessing transforms and encoding strategies to squeeze every last byte out of typical 68k executables.
On large real-world programs the best format achieves around 2.75:1 compression ratio. A fast-depack option is also available that decompresses in under a second on a stock 8MHz 68000. All formats support colour-cycling raster bars during decompression and run on any ST/STE/TT/Falcon.
The service is free and requires an exxos forum login.
🔗 https://www.exxosforum.co.uk/nrvpack/
🔗 https://www.exxosforum.co.uk/forum/viewtopic.php?t=8312
Comments
"the parser, probe-set logic, arithmetic coder, and 68k decompression routine are all original work"
... IMHO would be fair to mention that the tool has been created completely by AI: https://www.exxosforum.co.uk/forum/viewtopic.php?p=141477#p141477.
So I didn't spend 100+ hours of work on it myself then? *sigh*