a2fpga_core

Good catch, that's a mistake that's now been corrected, it's definitely 480p. The Github page (https://github.com/a2fpga/a2fpga_core) had it correctly.

Project co-creator here - that's actually the V1 board, the V2 board is here https://github.com/a2fpga/a2fpga_core/blob/main/boards/a2n20... and uses a slightly larger CPLD (complex programmable logic device) which is what's used to map and level shift the 5V signals from the Apple II bus to the 3.3V pins on the FPGA module. We use the Sipeed Tang Nano 20K FPGA module for the FPGA. Using a pre-built module like this is a great accelerator in this type of project because a lot of the more complicated things to get right, like the power supplies or the length of the traces for the HDMI connector, are done for you.

If you are as curious as I were what the card looks like, then have a look at this: https://github.com/a2fpga/a2fpga_core/blob/main/boards/a2n20... I always find it impressive how integrated our electronics have become and how few components are required to achieve what would have taken large, crowded PCBs in the past.

GitHub repo here - https://github.com/a2fpga/a2fpga_core/