While the "PS1 ROM" scene is slowly moving toward (Compressed Hunks of Data) format – which offers even better compression and checksum verification – the PBP format remains the king of convenience , especially for multi-disc RPGs and portable gaming.
Using .pbp file format for PS1 multi-disc games like Legend of Dragoon Ps1 Pbp Rom
You need (Windows) or popstation (command line). While the "PS1 ROM" scene is slowly moving