To me, I thought the interesting part was how he had to modify the hard drive emulator firmware to remove CPU wait states and support a streaming mode - I would

To me, I thought the interesting part was how he had to modify the hard drive emulator firmware to remove CPU wait states and support a streaming mode - I would have thought even the slowest SD card would be enough to overwhelm any 8 bit computer (I didn't even know SD cards had a special rarely used streaming mode).