It sounds like you're looking for the PSP portable version of the arcade classic Cadillacs and Dinosaurs (also known as Cadillacs: Kyouryuu Shin Seiki).
Files circulating under this name typically fall into three categories:
The pursuit of a "Cadillacs and Dinosaurs PSP ISO" is a common quest for fans of 90s beat 'em ups, yet it reveals a unique quirk of gaming history: the legendary Capcom title never received an official home console port. To play this post-apocalyptic classic on a handheld like the PlayStation Portable (PSP), users must rely on custom firmware and arcade emulation rather than a standard ISO file. The Arcade Legend and the Porting Gap
That is where the PSP ISO comes in.
This is the most efficient method for PSP. Standalone emulators like NJ’s CPS1PSP are designed specifically to run Capcom arcade games with zero lag.
Master the Dash: Double-tap forward to run and perform powerful flying kicks, which are essential for crowd control.
"Cadillacs and Dinosaurs" is a side-scrolling action-adventure game developed by Capcom. The game is set in a post-apocalyptic world where dinosaurs and humans coexist. Players take on the role of Jack Tenrec, a treasure hunter, as he navigates through a world filled with danger and excitement.
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, making it the most direct "native" way to play the game on the system without custom firmware.