I noticed the following effect in Nintaco and Mesen:
I assume it's related to
changing the palette mid-frame. Do any artifacts show up on a real NES?
No, they don't on mine.
Edit: I take this back, it does happen, just not on all resets. PPU alignment? See below.
The effect is also present in RockNES. I can't seem to open the ROM in Nintendulator. The effect is not present in FCEUX or Nestopia.
My capture device can see a bit further into the hblank than my TV will show. Here's a slow motion view of that.
Actually! I take this all back.
The artifacts do occur on a real NES, just not every time. I think this is a PPU alignment thing where some resets it will have no artifact, and some resets you'll see a few pixels worth.
So... actually those emulators are fine. I can make it look like that on some resets.
(FCEUX is not a good thing to compare against for pixel perfect timings like that, even New PPU mode in FCEUX only has a granularity of 8 pixels per CPU synchronization.)
Hmm. That's really interesting. Resetting the emulators consistently produces the effect. But that could be a consequence what happens to the PPU upon reset within the emulator.
Emulators don't have different CPU/PPU alignments like the real console does.
Oh, well I don't see any such artifacts on it, but I'm testing with PowerPak and that raster split is MMC3 IRQ based, so I couldn't tell you if this is an accurate emulation of that or not. (Indiana Jones on the other hand wasn't IRQ based, so I'd assume the PowerPak version is pretty close if not identical to the real cart.)
Zepper wrote:
Argh, ok, I'll spoil the same problem with Gauntlet II.
Those artifacts do not appear in other emulators.
rainwarrior wrote:
I'm testing with PowerPak
Can you post pics of the scanline and seam glitches in Super Mario Bros. 3 and Mega Man 3 ? I'm just curious what it's really supposed to look like
Also, does the scanline glitch appear on the NES Classic?
Quote:
the scanline glitch appear on the NES Classic?
I can confirm Megaman 3 (stage select) and SMB 3 have very obvious screen split glitches.
I don't own Gauntlet 2 nor Last Crusade.
dougeff wrote:
I can confirm Megaman 3 (stage select) and SMB 3 have very obvious screen split glitches.
Cool. I'm glad they did not patch the ROM or hack the emulator to conceal those issues.
You know, I misread your question.
I meant on an original NES.
I don't own NES classic.
Honest mistake, considering Mega Man 3 isn't even on the NES classic
Nice catch on this one! Is there something nestopia is not doing/or doing to get this effect? I tried numerous resets and none of this behavior happens.