If you validate Tenka / DW7 memcard hack on real hw, people will love you. Devs anyway. ;)
(our work = guess stuff. so unreliable in many ways)
(DW7 = $04/$08 flags)
(sio.c) http://www.sendspace.com/file/pj2p97
If you need help understanding basics Guncon, please ask. Calibration is a pita...