PSP Go Analog Joystick Replacement
Identification and Background
Released early October 2009, the PSP Go introduced a significantly smaller form factor than that of the original PSP.
The biggest change from previous PSP models is that the PSP Go does not have a UMD drive. Instead, it has 16GB of NAND flash memory soldered to the logic board.
The unit is expandable with a Memory Stick Micro (M2) flash card up to 32 GB. Sony claims that the battery is not user replaceable (unlike previous PSP models), but it is actually quite easy to replace the PSP Go's battery.
More information from Wikipedia: "The unit is 43% lighter and 56% smaller than the original PSP-1000, and 16% lighter and 35% smaller than the PSP-3000. It has a 3.8" 480×272 LCD (compared to the larger 4.3" 480×272 pixel LCD on previous PSP models). The screen slides up to reveal the main controls. The overall shape and sliding mechanism are similar to that of Sony's mylo COM-2 internet device."