A scandoubler is an interface that connects the RGB videooutput of any Amiga to a standard VGA monitor to allow all screenmodes on that monitor. It's not the same as a rgb to vga thing, because that only gives visible screens on a vga monitor if you use DoublePal or Multiscan screenmode, so screenmodes that require Pal will only give black screen. That's why a Scandoubler is so cool !! But the only back side is that it can be expensive, even 2nd hand. But on the other hand, a A1200 connected to a 19" monitor can be very cool too !!! :-)