This PSP remote interface article gets submitted from time to time, but keeps falling through the cracks for some reason. [XyTec] submitted it most recently and I finally remembered to post it. It’s a guide from last July on interfacing with the PSP’s remote port. The port is a serial interface at 2.5V so you need to do some level shifting. Once the cable is complete you can use it get a serial console, add GPS or dump debug info along with many other possibilities. A remote emulator program is provided.