Let’s be honest: The PSP is vintage hardware. If your goal is a portable San Andreas under 200MB (or close to it), you should use the device you are reading this article on.
The Official Mobile Port (Android/iOS):
Let’s address the elephant in the room immediately: Rockstar Games never released Grand Theft Auto: San Andreas for the PlayStation Portable.
The official PSP library included two masterpieces developed specifically for the handheld:
These games used a modified engine similar to San Andreas but featured entirely new stories, maps, and mechanics. They run flawlessly on PSP hardware because they were optimized for it. However, a native, official San Andreas PSP ISO does not exist.
So, what are people actually referring to when they search for a "200MB PSP ISO"?
Downloading full commercial ISOs of games you do not own (including modded versions) is copyright infringement. While individuals are rarely targeted, ISPs may throttle your connection or send warnings.