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Thank you so much! This is what I wanted to understand. You have explained very clearly.

4a. If PPU register $2000 bit 7 (NMI enable) is already on when PPU register $2002 bit 7 (VBLANK) gets turned on, an NMI will be generated. 4b. Similarly, If PPU register $2000 bit 7 is turned on when PPU register $2002 bit 7 is already on, another NMI will be generated. When does this happen? That...

No, the question is not about how late the 6502 handles interrupts. And about whether there is a delay in calling this interrupt from the PPU during the onset of the VBlank period.

Hello. Well, tell the fool. I am currently dealing with vbl and nmi timings in my emulator. The question torments me. NMI interrupts are called with the vblank setting, during 241 scanlines and 1 cycle? Or the NMI is invoked with a delay, and if so, why? I know ... the question is stupid, but I'm co...

Thank you very much! Everything is exactly as you said!

Hello. If I understand correctly, then to execute the branch instruction: If the jump was not made, then the instruction takes 2 cycles. If the transition was made, +1 cycle = 3 cycles. If boundary is crossed, +1 cycle = 4 cycles I am using the "2.Backward_Branch.nes" test. It gives the error "5) Br...

Thank you very much!

Good time of day.
I am writing my nes emulator. I am currently writing APU. This question arose. At what points do I need to make a sample selection to get 735 samples per frame. I know this is a stupid question, but the problem is that I can't associate the sample rate with the APU frequency.

Good day.
I am Russian and apologize in advance for my English.
I could not resist and say thank you!
I had the same problem!