Core 14: SD card support

Ok, first some background! When I designed an update to the AppleSqueezer some years ago, I had some space left on the PCB (the "printed circuit board"). I thought, perhaps I can add an SD card slot there, that way, it would be technically possible for AppleSqueezer users not to need any other form of disk storage, as they could boot directly from there. How nice would that be?? I was already…