How to Use Your Sony PSP: 10 Steps (with Pictures) - wikiHow
Modifying the PSP By Michael Hansell. What type of Power does the PSP have? PSP CPU (System clock frequency 1~333MHz) 32MB Main Memory 4MB Embedded DRAM. - ppt download
PlayStation Portable Custom Firmware [Mega Thread] - The Tech Game
10 Days of Hacking, Day 4: The PSP, Part 1 - Wololo.net