Very cool. Having done a bit of NES dev I can imagine this wasn't super straightforward to make performant for the graphics, given you can typically only have a few sprites on a row before the NES starts to 'dissolve' them (not sure the term).

I wonder if it's using the background tile map for this instead of sprites, though that's also an impressive amount of graphics bandwidth.

> with full audio playback rate (44.2kHz)

The audio being so clear is also impressive, is that something that the card extends? IIRC the PCM channel on the NES isn't anywhere near that bitrate, and is also 8-bit sample size.