a regular 68000 processor will generate a read operation when using the clr.b/.w/.l opcodes, this was fixed / changed on the 020.

I'm not aware of any software explicitly requiring this right now, but it would be detectable if you have read-triggered hardware and various 68k documents advise caution when using the opcodes / porting code using said opcodes to a 020 based machine for that reason.

There was some private discussion with Charles before doing this, apparently it is detectable on the Genesis where a read from the VDP port will increment the internal address counter.

git-svn-id: svn://dspnet.fr/mame/trunk@24991 749742ba-7341-0410-aadc-df50b521781e
HISCORE DIFF's for all MAME versions without hiscore support

The diff performs the following:
1) Adds hiscore support back into MAME
2) Removes all nag screens
3) Removes loading messages (decoding/decrypting/Updating Artwork, etc.) and the 'white box' when loading.

 Add the following to the mame.ini file to disable the appropiate patch section:

disable_hiscore_patch   1   <- To disable highscore support. Set to 0 or omit it entirely from ini file to enable.
disable_nagscreen_patch   1  <- To disable removal of nagscreens /white box. Set to 0 or omit it entirely from ini file to enable.
disable_loading_patch   1      <- To disable suppresssion of loading/decypting/etc messages. Set to 0 or omit it entirely from ini file to enable.
Adding the GroovyMame's patch