Weird audio bug on toploader, nesRGB or Faulty CPU?

[tzibu]

Hi,

I've installed several nesRGB's before, but I did Toploader for the first time today.
Did basically like I did AV famicom before but I installed the Voultar QSB FFC kit into it.

https://youtu.be/KHpnXFmxYVY

For some reasons the audio is weird. I think the picture quality is ok, but somehow the audio sounds pitched and weird.

Could the problem be with nesRGB or CPU?

chceck it: https://youtu.be/KHpnXFmxYVY

You can hear it when jumping example.

[Joe]

What's going on at the top of the screen? That doesn't look normal.

[tzibu]

What's going on at the top of the screen? That doesn't look normal.

Ah heh!
If you mean that gray "line", then that is just something from my OBS-layer.
Not from Nintendo

[tzibu]

Here is an another example.

https://youtu.be/uACMsX47fU4

[Joe]

Maybe there's a power issue causing the APU to glitch? Otherwise I'd guess it's a faulty CPU.

[Fiskbit]

For the pitch to change, I would expect that to require the CPU running at the wrong clock speed.

There have been several reports that laser-marked H CPUs can have DPCM playback glitches when used with both NESRGB and an Everdrive. However, there shouldn't be any laser H CPUs in NES toploaders (they stopped NES-101 production years before laser H chips were made), and this is a very specific issue that seems completely different to me than changing pitch APU-wide.

[dink]

Sounds to me like the sweep unit of the apu has gotten damaged somehow

[tzibu]

Sounds to me like the sweep unit of the apu has gotten damaged somehow

So I should try to find a new CPU.

[dink]

Sounds to me like the sweep unit of the apu has gotten damaged somehow

So I should try to find a new CPU.

Just for good measure, check the voltage going to the cpu before installing a new one

[tzibu]

Sounds to me like the sweep unit of the apu has gotten damaged somehow

So I should try to find a new CPU.

Just for good measure, check the voltage going to the cpu before installing a new one

4.92V

system has been recapped and there is a new voltage retulator.

[dink]

So I should try to find a new CPU.

Just for good measure, check the voltage going to the cpu before installing a new one

4.92V

system has been recapped and there is a new voltage retulator.

perfect

[Fiskbit]

I asked for opinions on Discord and the general feeling is that the mod is corrupting internal APU state somehow, so this may actually be similar to the DPCM playback bug we've encountered before, just manifesting in a new way on a different chip revision. I would argue that if NESRGB is triggering APU state corruption across many CPUs that otherwise behave normally, that suggests some kind of design flaw with the mod rather than the CPU being faulty. Whatever the case, it sounds like this CPU is perfectly fine for unmodded systems.

[tzibu]

I asked for opinions on Discord and the general feeling is that the mod is corrupting internal APU state somehow, so this may actually be similar to the DPCM playback bug we've encountered before, just manifesting in a new way on a different chip revision. I would argue that if NESRGB is triggering APU state corruption across many CPUs that otherwise behave normally, that suggests some kind of design flaw with the mod rather than the CPU being faulty. Whatever the case, it sounds like this CPU is perfectly fine for unmodded systems.

Chip is
RP2A036
3CH 3Z