I have finally fixed the floppy boot including its FAT12 init. There were many, many problems, I was running around in circles but I finally fixed it. The last thing I did was rewrote the EDD stuff front and back, and I assume that fixed it. I, honestly, am not sure. But anyways, now both HDD and floppy boot work including FAT12 init and all functions of BASIC that I have implemented insofar.