before i do next commit, some hw notes and cleanups in machine config

git-svn-id: svn://dspnet.fr/mame/trunk@23385 749742ba-7341-0410-aadc-df50b521781e
modernized the TMS9927 device [Fabio Priuli]

git-svn-id: svn://dspnet.fr/mame/trunk@23386 749742ba-7341-0410-aadc-df50b521781e