what is this port for? serial?

[ashy]

http://i42.photobucket.com/albums/e348/AshyXT/acs451/IMG_4193.jpg

thx in advance for helping

[deedee]

Given this is posted in the Alpine thread i would guess it is the port for the expansion back pack which offers an extended battery and a Compact Flash slot, along with a video (SVideo, VGA and composite) out port.

I have such a backpack but don't use it a great deal.