PlayStation Vita Prototype Is Now Selling On EBay For RM81446 - Lowyat.NET
Sony Unveils a New PSP Portable Console - The New York Times
PSVita Slider Prototype Unit with HDMI Output running FW 0.990 now on sale on eBay! - This prototype unit can be yours for the measly sum of... $20,000! - Wololo.net
Old PROTOTYPE PlayStation Vita MODEL! | PSP Go Styled PS Vita?! - YouTube
Prototipos perdidos de la primera PSP (Muy interesante) | PSP.SceneBeta.com
Sony shows PSPgo converter cable thing | Eurogamer.net
I wonder if anyone has this prototype PSP keyboard in their collection and if it actually worked. It was shown during E3 2004 & disappeared : r/PSP
Flexible PSP 2 Prototype | Playfeed
Photographs that are considered as prototypes of "PSP mobile" will be released, appearance similar to "PSP go" - GIGAZINE