While browsing the news over at the great website psp-vault.com, i found a … calculator emulator. The purpose of this is still unknown to me but here is what psp-vault.com had to say:

“A coder named xz-81 has released an HP48 Calculator emulator for the PSP. It’s already in version 1.0, and “working fine,” so give it a shot if you’re uhh…into calculating things.”

Thanks again to PSP-vault.com for this info.