This takes me back. My first PC was a decommissioned CAD. It was a WYSE branded AT compatible with a passive-mainboard (i.e. the mainboard was just the bus, a

This takes me back. My first PC was a decommissioned CAD. It was a WYSE branded AT compatible with a passive-mainboard (i.e. the mainboard was just the bus, and the CPU was on a carrier that plugged into the bus), and an HGA connected to an amber display. As an aside, the Sierra adventure games supported HGA, but many of them were designed for color, making certain puzzles rather difficult to solve.