Having display problems with the games you're running through TTYman's PSP UAE4ALL emulator? If you are, you may want to take a look at this homebrew that developer john4p released. It's a series of mods for TTYman's emulator that changes your PSP's default 480x272 screen resolution to either 320x200 or 384x216.

Running these should get games like Stunt Car Racer to run on your console while avoiding the problems of your display's outer edges getting cropped. Also included in this release are options for your to release your screen's vertical alignment, in case you're up for some extra fine-tuning.

Each of the new resolutions comes as a separate EBOOT file - swap them out with TTYman's emulator EBOOT to change your resolution. Keep in mind that each new screen res comes with a new control set - full details on this are available in the file bundle's readme.