It’s been awhile since the Z-man touched on this one… Rob_psp’s PSP-PDA v1.3.2 — a collection of PDA derived applications for the Sony hand held; including notepad, a music player, image viewer, address book, calendar, calculator, and clock.

PSP-PDA v1.3.2 changes:

• Fix IR keyboard issue with fw >= 3.80 for FAT PSP (thanks to Angelo)
• Should work properly with psp SLIM and fw 3x

Download:
PSP-PDA v1.3.2 fw 1.50
PSP-PDA v1.3.2 cfw 3.xx
PSP-PDA v1.3.2 source code

- source: ZX-81’s web site