The developer behind the hack notes the following:
Now my first thought is that the Retron5 can not properly emulate MMC5. However I'm also curious about the cart designation.There is a fast way to learn if my rom will play perfectly on an emulator you use. Watch the intro after the title screen fades away. I have a golden scroll moving up the screen. If that scroll & text comes up garbage, then you should stop playing unfortunately. This is because the emulator you are using, is not utilizing the MMC5 register $5130 correctly. I perform chr swaps for 3 specific things, the intro, a mini game, and the Ganon fight. If you continue to play the game with the garbaged gfx, it will obviously look bad, and it might even crash.
My cart is reported as: Legend of Zelda, The (USA) (Rev A)
While the author notes the rom should be used with: Legend of Zelda, The (U) (PRG0)
Considering that rom naming is likely different between goodrom naming and the Retron5 itself, I'm unsure if I am even using the correct version. Now I did find a rom of Rev A and already had on for PRG0 and may try to do a little frankenpatching, however I thought I'd throw out the question to anyone who might be in the know on this subject to see which theory holds up.
Thanks in advance.