Search found 9 matches

by ashkalov
Fri Aug 28, 2020 11:48 am
Forum: NESemdev
Topic: VBlank and NMI timing
Replies: 8
Views: 3113

Re: VBlank and NMI timing

Thank you so much! This is what I wanted to understand. You have explained very clearly.
by ashkalov
Fri Aug 28, 2020 10:37 am
Forum: NESemdev
Topic: VBlank and NMI timing
Replies: 8
Views: 3113

Re: VBlank and NMI timing

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...
by ashkalov
Fri Aug 28, 2020 10:07 am
Forum: NESemdev
Topic: VBlank and NMI timing
Replies: 8
Views: 3113

Re: VBlank and NMI timing

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.
by ashkalov
Fri Aug 28, 2020 2:42 am
Forum: NESemdev
Topic: VBlank and NMI timing
Replies: 8
Views: 3113

VBlank and NMI timing

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...
by ashkalov
Tue Aug 25, 2020 10:52 pm
Forum: NESemdev
Topic: An error in the branch test
Replies: 2
Views: 2112

Re: An error in the branch test

Thank you very much! Everything is exactly as you said!
by ashkalov
Tue Aug 25, 2020 10:19 pm
Forum: NESemdev
Topic: An error in the branch test
Replies: 2
Views: 2112

An error in the branch test

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...
by ashkalov
Thu Aug 20, 2020 1:06 am
Forum: NES Music
Topic: Nes sampling rate
Replies: 2
Views: 1710

Re: Nes sampling rate

Thank you very much!
by ashkalov
Wed Aug 19, 2020 11:21 pm
Forum: NES Music
Topic: Nes sampling rate
Replies: 2
Views: 1710

Nes sampling rate

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.
by ashkalov
Mon Jun 01, 2020 3:46 am
Forum: NESemdev
Topic: [SOLVED] SMB Title Screen isn't rendering in a proper way
Replies: 5
Views: 9570

Re: [SOLVED] SMB Title Screen isn't rendering in a proper way

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!