| P<sub>r</sub> signal (red-luma)
|}
=== Memory Stick ===
The Memory Stick slot on the PSP-1000, PSP-2000, and PSP-3000 series can accept MemoryStick Duo, MemoryStick PRO Duo, or Memory Stick Micro cards with an adapter. The PSP Go (PSP-N1000) can only accept Memory Stick Micro cards. The maximum capacity of external cards is generally 32 GB, but special adapters and custom firmware may increase this limit.
==== Pinout ====
The below table describes the full pinout of the Memory Stick running in parallel mode. For serial communication (which the PSP uses), pins 3, 5, and 7 are open.
{| class="wikitable"
! Pin
! Signal
! Direction
! Description
|-
| 1
| VSS
|
|
|-
| 2
| BS
| IN
| Bus State - Indicates bus state (0-3) on the SDIO and the timing to start signal transfer
|-
| 3
| DATA1
| IN/OUT
| Data - Open in serial mode
|-
| 4
| SDIO/DATA0
| IN/OUT
| Serial Data In-Out / Data - Transfer direction and types of data change depending on the Bus State
|-
| 5
| DATA2
| IN/OUT
| Data - Open in serial mode
|-
| 6
| INS
| OUT
|
|-
| 7
| DATA3
| IN/OUT
| Data - Open in serial mode
|-
| 8
| SCLK
| IN
| Serial CloCK - Host device outputs signals on BS and SDIO at falling edge and inputs (latches) at rising edge. SCLK is always output during BS1-BS3
|-
| 9
| VCC
|
|
|-
| 10
| VSS
|
|
|}
==== Notes ====
Both Pin 1 and Pin 10 will be connected to VSS.