there are schematics on aminet for adapters, you have to add a chip (ttl buffer?) to prevent the the display chips for trying to genlock and get fried. just putting the right wires accross can result in damage from what ive heard. i got a commodore adapter back when i had my 1200 and it sucked really really freaking bad until i got an nec3d monitor that can sync to normal amiga rates.
