Comment by gwbas1c

> The video timing in the NES is non-standard - it both generates 341 pixels, making 227 1/3 subcarrier cycles per scanline, and always generates 262 scanlines. This causes the TV to draw the fields on top of each other, resulting in a non-standard low-definition "progressive" or "double struck" video mode sometimes called 240p

Ahh: I always wondered why I never saw interlacing artifacts on the NES! (I'm going to assume the same thing for the SNES too.)