Adapting Apple's RGB Color Monitor for Analogue & MiSTer

While the Apple IIgs could connect to a composite display, Apple released a high-quality color RGB monitor specifically designed for the IIgs. This monitor was called the Apple Color RGB Monitor, A2M6014. It was the only color monitor Apple ever released which could accept full analog RGB video signals at the standard 240p/480i resolution (using a 15.7KHz horizontal line frequency). I have…