Keeps original graphics, audio, and gameplay intact.
Resident Evil PSP ISO Highly Compressed Download: Ultimate Retro Gaming Guide Resident Evil Psp Iso Highly Compressed Download
For PS1 games (the ones ported to PSP), the files are different. They are converted into files, which are also highly compressed. When creating these from your own PS1 discs, you can often set compression levels (from 1 to 9), with level 9 offering the smallest size. This is how you see games like a Resident Evil 2 beta packaged as a 320.4 MB download instead of the full disc size. Keeps original graphics, audio, and gameplay intact