(MESS) cybiko updates: [R. Belmont]
- Fixed major memory stomp in cybikov2
- Fixed "insert battery" message in cybikoxt; the OS boots up now
- Started general cleanup of I/O handling



git-svn-id: svn://dspnet.fr/mame/trunk@29851 749742ba-7341-0410-aadc-df50b521781e