Staringlizard has developed a replacement for the Amiga A520 adapter. The Amiv 2.0 can convert the Amiga RGB 15KHz signal to HDMI to make it possible to connect your A500 or A1200 to a modern screen. The Amiv has buttons to shrink the picture horizontally and move the picture horizontally and vertically.
YouTube: AMIV 2.0 – Amiga A520 adapter HDMI remake
Website: http://www.staringlizard.com