If You Look At The Chip In The Picture That Ive Circled It Is The H8/3294 Which Is A Single Chip Microcomputer, According To Some Documentation On The Chip It Has The H8/300 CPU In It, I'm Hoping This Opens Up Emulation For The 64DD!
True But The 64DD Devides The Code Between The 64's Processor And It's Own, The h8/3294 Has Everything For Graphics, Sound And Everything Else, It Would Be Far To Powerful Just For The Clock