An file (International Organization for Standardization) is essentially a disc image—an archive file that contains an exact duplicate of the data found on an optical disc. In the context of the PSP, game discs were known as UMDs (Universal Media Discs). When a UMD is "dumped" (copied) to a computer, the resulting file is usually an ISO.
If you download a file named Plants_Vs_Zombies_USA_PSP-ISO.rar from a random forum, you will likely find one of two things: Plants Vs. Zombies Psp Iso
After all, the zombies are coming—whether you're playing on a PC, a phone, or a hacked 15-year-old Sony handheld. And your peashooters need to be ready. If you download a file named Plants_Vs_Zombies_USA_PSP-ISO
To understand the search for the ISO, one must first ask: Why did PopCap/EA skip the PSP? Plants Vs. Zombies Psp Iso
Yes! The PS Vita has an official Plants vs. Zombies port (from the PlayStation Mobile store). It runs flawlessly and can be played on a PSP via the Vita’s backward compatibility? No – but you can buy a Vita. Alternatively, the Vita can emulate PSP homebrew even better.
These fan ports are often very small (around 28MB) and run smoothly on all PSP models, including the PSP-1000 with its limited RAM. How to Play It