For PS1, SNES, Genesis, GBA, and MAME arcade, Retroboot 1.2.1 is a masterpiece.
While newer versions of RetroArch support features like Run-Ahead (for lag reduction) and AI translation, they require heavier processing. On the PSC's modest hardware, those features cause slowdown. Retroboot 1.2.1 refuses to sacrifice frame rate for flash. retroboot 1.2.1
If you are looking for information typically found in a "paper" (such as documentation, release notes, or installation instructions), here are the key details for version 1.2.1: Overview & Documentation For PS1, SNES, Genesis, GBA, and MAME arcade, Retroboot 1