I've tried to find the answer to this topic, but I didn't know what exact words I have to look for, so I'm just asking the question here:
How many PPU updates can you approximately do during the NMI again on an NTSC console? What was that value again?
Assuming that your NMI does nothing else but saving and restoring the registers, checking a boolean variable to see whether it's allowed to do anything at all, setting that variable to false in the end and doing the scrolling every time in the end, how many tiles may I write per NMI before vblank ends? Was it two columns? Three?
How many PPU updates can you approximately do during the NMI again on an NTSC console? What was that value again?
Assuming that your NMI does nothing else but saving and restoring the registers, checking a boolean variable to see whether it's allowed to do anything at all, setting that variable to false in the end and doing the scrolling every time in the end, how many tiles may I write per NMI before vblank ends? Was it two columns? Three?