i386: Added the ability to read and write to the Pentium and P6 event/performance counter MSRs.  Nothing is actually counted, though.  Also added reading and writing of the time stamp counter MSR.

git-svn-id: svn://dspnet.fr/mame/trunk@26447 749742ba-7341-0410-aadc-df50b521781e
various PGM protection cleanups / fixes (orlegend, olds, svgpcb) [iq_132]

git-svn-id: svn://dspnet.fr/mame/trunk@26448 749742ba-7341-0410-aadc-df50b521781e
Converted video/pc_t1t to a device. (nw)


git-svn-id: svn://dspnet.fr/mame/trunk@26451 749742ba-7341-0410-aadc-df50b521781e
flag pins are inverted

git-svn-id: svn://dspnet.fr/mame/trunk@26452 749742ba-7341-0410-aadc-df50b521781e
tms9900: More cycle fine-tuning. (nw)


git-svn-id: svn://dspnet.fr/mame/trunk@26453 749742ba-7341-0410-aadc-df50b521781e
fix cur_reg being overwritten

git-svn-id: svn://dspnet.fr/mame/trunk@26454 749742ba-7341-0410-aadc-df50b521781e
this chip is write-only

git-svn-id: svn://dspnet.fr/mame/trunk@26455 749742ba-7341-0410-aadc-df50b521781e
document global regs

git-svn-id: svn://dspnet.fr/mame/trunk@26456 749742ba-7341-0410-aadc-df50b521781e
NEW GAME NOT WORKING
beatmania IIDX (863 JAB) [Guru]

Redumped some beatmania IIDX CD's [Guru]

git-svn-id: svn://dspnet.fr/mame/trunk@26457 749742ba-7341-0410-aadc-df50b521781e