Allows you to maximize limited space on Pro Duo adapters or MicroSD cards.
The best tool for compressing ISOs to CSO format is , developed by Unknown . It's a fast, multi-threaded compression program that works with PSP and PS2 emulators. Maxcso supports multiple algorithms including zlib, 7-zip deflate, and Zopfli, offering up to 9 compression levels for optimal balance between file size and performance. cso psp archive
Once you have your CSO file, you'll need to know how to use it depending on your setup. Allows you to maximize limited space on Pro