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For questions regarding graphical - as opposed to text - processing and display.
21
votes
2
answers
9k
views
Why do NES sprites flicker when there are a lot of them?
Sometimes, NES sprites flicker when there are a lot of them, like at 1:19 in this video of Super Mario Bros. Why did they do this?
30
votes
Accepted
Why do NES sprites flicker when there are a lot of them?
The Picture Processing Unit (PPU) in the NES can only draw 64 sprites per frame and 8 sprites per horizontal line (scanline). If the game tries to draw more than that, some of them will be invisible. …
36
votes
1
answer
6k
views
How can I create a split-scroll effect in an NES game?
Games like Super Mario Bros. and Super Mario Bros. 3 were able to scroll the playfield but not the status bar:
The status bars are clearly too big to be sprites, yet they don't scroll with the ba …
43
votes
Accepted
How can I create a split-scroll effect in an NES game?
This is done by changing the scroll mid-screen.
This is what the nametables look like on scanline 30 in Super Mario Bros, with the scroll shown:
The horizontal scroll is 0 (you can barely see the …
19
votes
Accepted
8-bit console horizontal resolution
The NES did not use an extra bit for sprite positions. A sprite's X-position was the position of its left edge, which means that sprites cannot be placed partially off the left side of the screen:
…