Apple PowerBook Video Adapter (Accessory for 540c)

This is a PowerBook Video Adapter (HDI-15 to DB-15) that was included with the Apple PowerBook 540c. It plugs into the display port on the back of the 540c, allowing you to use a D-sub 15-pin display cable for Macintosh. On the 540c, it enabled mirroring of the main display or the use of two displays, the internal and an external one. It appears to be compatible with models such as the 3400c.
This is a rare adapter that is difficult to find nowadays. We encourage those who need it to consider purchasing it.