s3: Added MMIO registers for read and write masks (no whatsnew)

git-svn-id: svn://dspnet.fr/mame/trunk@22507 749742ba-7341-0410-aadc-df50b521781e
(mess) psxcd: fix potential bugs (nw)

git-svn-id: svn://dspnet.fr/mame/trunk@22508 749742ba-7341-0410-aadc-df50b521781e
made BEEP and RAM devices initialize in constructor of driver classes (nw)

git-svn-id: svn://dspnet.fr/mame/trunk@22509 749742ba-7341-0410-aadc-df50b521781e
s3,s3virge: added bits 8 and 9 of VGA Offset register. (no whatsnew)

git-svn-id: svn://dspnet.fr/mame/trunk@22510 749742ba-7341-0410-aadc-df50b521781e
New skeleton driver
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Ravensburger Selbstbaucomputer [Robbbert]

git-svn-id: svn://dspnet.fr/mame/trunk@22511 749742ba-7341-0410-aadc-df50b521781e
reimplemented mlanding analog controls, but it's still about as bad as it was before

git-svn-id: svn://dspnet.fr/mame/trunk@22512 749742ba-7341-0410-aadc-df50b521781e