Figure out what's up with zelda's intro

[shish]

there are a bunch of graphical glitches in all implementations, so it seems like I got something wrong in interpreting the hardware docs

opus5 also shows very similar issues if anyone wants a free rom to test with

[shish]

scroll-y is handled much better now, most games are good... zelda's intro still has a couple of glitches though :(

[shish]

I read in some blog somewhere (Can't remember or find it :( ) somebody posted "you'll get glitches like this if you aren't careful to accurately emulate sub-pixel CPU timings", with an image of what looks like the glitches I'm seeing.

Drawing one row of pixels at a time is about as complicated as I imagine rosettaboy getting, so I'd say we just need to live with this (unless somebody comes up with a pixel-perfect GPU implementation, which is also simple to understand and maintain, and implement across languages)