Mitsubishi-made conversion connector AD-A205 (Included with a Diamondtron monitor purchased in 1997. It was unused, still in its original packaging, and has been stored away in a drawer.) At the time, Macs (Quadra, Power Macintosh, etc.) used a "2-row D-sub 15-pin" connector for video output. On the other hand, monitors from companies like Mitsubishi Electric primarily used a "3-row mini D-sub 15-pin (VGA)" connector, so I recall that this kind of conversion adapter existed.