http://www.happybison.com/reviews/installing-freenas-on-acer-aspire-easystore-h340-6/
Very similar physical hardware to the MediaSmart Server:
http://www.mediasmartserver.net/2009/04/27/hardware-commonalities-between-the-hp-mediasmart-server-and-acer-easystore/
Details and pinout for VGA/PS2/Serial cable:
http://www.mediasmartserver.net/forums/viewtopic.php?t=622
Generation 2 cable:
http://www.mediasmartserver.net/forums/viewtopic.php?t=3980
Generation 3 cable:
http://www.mediasmartserver.net/forums/viewtopic.php?f=6&t=8066