Foxconn has been around since the early 80's making PC related components (cables, connectors, etc.). I think they just recently started making MBs (i.e. within the last few years.)
"Foxconn is the registered trade name of Hon Hai Precision Industry Co., Ltd. Hon Hai is a global leader in providing mechanical and electromechanical solutions to the communications, consumer, and computer industries. The world's largest manufacturer of PC connectors, Hon Hai is also one of the world's leading manufacturers of cable assemblies, desktop PC chassis, and server enclosures. "