i use mame from mamdev.org mame.exe game -nothrottle -syncrefresh this will give you perfect smooth scrooling in all games no matter the refresh rate of the game off course there will be sound hickups and lower rate games will run a little bit accelerated, but you will have perfect smooth scrolling P.S. do not use -mt (multithreading)option, off course your screen set at 60Hz
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