The A2FPGA A2N20 v2.0 is a unique HD video and Mockingboard-compatible sound card for Apple II computers. It uses modern FPGA technology to accurately interface with the Apple II bus, providing crisp 720p 60Hz HD display and support for various popular peripheral cards. The card has been tested with multiple Apple II models and enhances the classic Apple II experience on any monitor or TV. Controversially, some peripheral cards in Slots 4 or 7 may not work correctly. Surprisingly, the card is not an emulator but a full implementation of original hardware components. Firmware updates and DIP switch settings allow for customization and troubleshooting.
https://wiki.reactivemicro.com/A2FPGA