If you're looking at this listing, you probably have a DOS Compatibility card in your Mac, but lack the custom cable to actually use it. This was my situation as well, so I decided to create my own solution.Proper trace width, route optimization, and ground planes were utilized when designing my adapter.This custom assembly is a direct replacement for the bulky and ultra-rare "Y-Cable".
Each assembly is fully tested in my Power Macintosh 6100 using a period-correct Apple CRT monitor. It is also compatible with the Quadra 610. This adapter allows the use of a dedicated monitor with your DOS card, or monitor sharing between the Mac and DOS environments. Additionally, the joystick port allows controllers to be connected on the DOS side. What you see is what you'll receive (HD26 cable, adapter board, and 3D printed case). Thanks for looking and have a great day!
If you need an adapter for the PCI PC compatibility card, please check my other listings.