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The accessory port found only on the original Vita models is a custom port USB interface.
It is commonly believed that code to enable the port was removed in 1.69 however
This is actually not true.
Even on the latest firmware the accessory port can be enabled using
    sceUsbServAccessoryActivate
and disabled with
    sceUsbServAccessoryDeactivate
The port is mostly compatible with drivers for the full sized USB Port on the PlayStation TV. Only difference being 3.3v power and logic levels, instead of 5v.
==== Pinout ====
{| class="wikitable"
{| class="wikitable"
! Pin
! Pin || Signal
! Name
! Description
|-
|-
| 1
| 1 || VCC
| GND
| Ground - On the side with the mounting hole that has threads
|-
|-
| 2
| 2 || D-
| ID (1.8v)
| USB OTG
|-
|-
| 3
| 3 || D+
| D-
| USB Data
|-
|-
| 4
| 4 || N/C (floating?)
| D+
| USB Data
|-
|-
| 5
| 5 || GND
| VBUS (3.3v)
|}  
| Power
|}


==== Offical usage ====
The accessory port found only on the original Vita models is a custom port USB interface.
There are only a few documented uses for the accessory port on the PSVita.


===== FCC =====
It is commonly thought that api to enable the port was removed in 1.69 however. This is not true. Even on the latest firmware the accessory port can be enabled using sceUsbServAccessoryActivate and disabled with
[[File:Fccpdel1001.jpg|thumb|right]]
sceUsbServAccessoryDeactivate.
In the FCC filing for the PDEL-1001 development unit. It seems that some dongle attached to the device is used as part of their hardware testing framework.
===== Accessory to USB adapter =====
[[File:Accessory port adapter.jpg|thumb|right]]
An Accessory port to USB adapter board was sold on auction sites awhile ago. It comes from a PSVita factory in China that was being repurposed for other things. since production of the PSVita has stopped.


==== Unoffical usage ====
The only documented usages of this port is from an FCC filing for the PDEL-1001 development unit. It seems that some dongle attached to the device is used as part of their hardware testing framework.
There have been some usage of the accessory port outside Sony


===== VitaShell =====
As well a Accessory port to USB adapter that appeared on auction sites awhile ago.
VitaShell can mount a USB Mass Storage device plugged into the accessory port.  
[[File:Accessory port adapter.jpg]]
as seen in [https://youtube.com/watch?v=ImVMUpN9bDo&t=20m55s this video on youtube]


==== Simular Connectors ====
The sheilding on the port is simular to what is used on the Panasonic K1HA14AD0001 camera.
The sheilding on the port is simular to what is used on the Panasonic K1HA14AD0001 camera.


However. The pin layout on this is incorrect and will short the accessory port if plugged into a psvita.
However. The pin layout on this is incorrect and will short the accessory port if plugged into a psvita.
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