Serial Adapter
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The PSP's headphone remote (HPRM) port contains a connection to UART4 in order to implement rewind, fast forward, and play / pause. This connector is often repurposed for debugging.
Below are the HPRM pinouts for various PSP models along with instructions on how to build your own HPRM to serial adapter.
PSP-1000
This was originally documented by Marcus Comstedt More information on the HPRM serial protocol can be found on his page.
The PSP-1000's HPRM port operates at 2.5v
| Pin | Signal | Notes |
|---|---|---|
| 1 | Mic input | microphone signal, decouple with a capacitor to audio ground when using (sleeve of 3.5mm connector) |
| 2 | GND | Digital ground |
| 3 | UART4 TXD | PSP UART4 transmit |
| 4 | nWakeup | Ground this pin to wake PSP from standby |
| 5 | VCC_2v5 | 2.5v supply |
| 6 | UART4 RXD | PSP UART4 receive |
PSP-2000 & PSP-3000
PSP-2000 and PSP-3000's HPRM port is expanded to also carry video out signals. Serial signals operate at 1.9v on these models.
| Pin | Signal | Notes |
|---|---|---|
| 1 | Mic input | |
| 2 | UART4 TXD | PSP UART4 transmit |
| 3 | DGND | Digital ground |
| 4 | Y | Luma component video signal (green jack) |
| 5 | VGND | Video ground |
| 6 | Pr | Red / Luma difference component video signal (red jack) |
| 7 | UART4 RXD | PSP UART4 recieve |
| 8 | VCC_1v9 | 1.9v supply |
| 9 | Video Det | Video detect, 42k resistor to GND signals a composite cable |
| A | nWakeup | Ground this pin to wake PSP from standby |
| B | Pb | Blue / Lume difference component video signal (blue jack) |
| C | VGND | Video ground |