If you're looking at this listing, you probably have a PC Compatibility card in your Mac, but lack the adapter to use the darn thing. This was my situation as well, so I decided to create my own solution. This custom assembly is a direct replacement for the bulky and ultra-rare "Y-Cable". Each assembly is fully tested in my Power Macintosh 8500 using a period-correct Apple CRT monitor. This adapter allows the use of a dedicated monitor with your DOS card, or monitor sharing between the Mac and DOS environments. What you see is what you'll receive (HD26 cable, DB15 cable, adapter PCB, and 3D printed case). This adapter is designed for use with the PCI-based PC compatibility card, not the DOS card found in the Power Macintosh 6100 or Quadra 610. If you need that adapter, please see my other listings. Thanks for looking and have a great day!