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Uncle Jam known for coding the dax prx for devhook has now released a new compression format known as "JSO" and is said to be faster than both cso and dax,

heres a quote from uncle jam:

What is JSO ? JSO is a new file format that intends to achieve faster decompression and/or smaller file size. JSO supports the following
- zlib (as CSO and DAX) and lzo compression. lzo is a bit faster than zlib but files are a bit bigger
- frame size from 2048 (as CSO) to 16384 for better compression
- small memory footprint, thanks to minilzo and kerner zlib decompression library

Howto
=====
As always, just drop the umdciso.prx file in [MP_ROOT]/dh/kd and replace the existing file.

You will find three folders:
- full/umdciso.prx
Full version with DAX & JSO file support (56 kbytes)
- nodax/umciso.prx
JSO file support, DAX file support removed for a smaller memory footprint (15 kbytes)
- pc/jiso.exe
JSO Compression/Decompression utility. Type jiso.exe -h for help.

Jiso ISO9660 converter Ver.1.00 by Uncle Jam

Usage: jiso.exe -c|d [-s] [-a algorithm] [-b size] [-l level] [-t threshold] -i
inputfile -o outputfile

-h : This help page
-c|d : Compress | Decompress
-s : Simulation mode enabled
-a algorithm : Compression algorithm (lzo, zlib), default is lzo.
-b size : Block size (2048, 4096, 8192, 16384), default is 2048
-B : Block header mode enabled (faster decompression)
-l level : Compress level (1=fast/large - 9=small/slow), default is 9
-t threshold : Compress threshold (0.0 - 1.0), default is 1.0
-i inputfile
-o outputfile

Note : The -B option has shown pretty bad results so far. You should not use it.

I have just updated my PSP ISO Compressor to Version 1.4 after news of a new compression formt - JSO. This is quite a quick update, there will be a future one improving some of the features from JSO such as the algorithm method etc

Lets see what has changed quoted from the readme

* JSO Support added along with all different combinations of conversions
* Delete input file added so you can automatically delete the image your converting from
* You can now get the program to browse to the location of the output for you after conversion
* Gradient effects removed to stop the annoying FM20.DLL bug that made the compatibility of 1.3
really low. As far as I am aware only Windows 98 will need additional software and thats vb6
runtimes, and I could include a DLL to get round that problem however it's 1.3mb so i decided
not to.

Now that has been said there is nothing more to say other than give you the download link. Please note that people with problems running 1.3 should have none running this version as mentioned above. ActiveX pad can also be removed which is what i told people to install to allow 1.3 to work.

Si on adapte un devhook à ce format , esperont qu'il ne rame pas comme le cso