Are there any high-resolution screenshots of the South American Famiclone for PAL-M and PAL-N video?

[Charizard700]

Hi,
I'm looking for high-resolution screenshots of PAL-M (Brazil) and PAL-N (Argentina) video from South American Famiclone devices.
I'm curious to see what kind of color artifacts they exhibit.
I can't seem to find much online.

I've found some on YouTube, but it seems like it takes some skill to search.
For example, you can find videos by searching for "famiclone PAL 60" or the PPU chip names "UA6548" and "TA-02NP."
(In South America, PAL-60 can also mean PAL-N-60 or PAL-M.)

Also, the following nesdev wiki article seems to list the clock rates for PAL-M and PAL-N.
Cycle reference chart
https://www.nesdev.org/wiki/Cycle_reference_chart

If you know of any more detailed sources, please let me know.
Based on the information on wiki, calculating the color subcarrier cycles per scan line, we get:
NTSC 227⅓ @60.0988Hz
PAL 284⅙ @50.0070Hz
PAL-M 227⅓ @60.03Hz
PAL-N 227⅓ @50.5027Hz
(Note: PAL-60-4.43/NTSC-60-4.43 @59.55Hz)

This suggests that the NTSC 227⅓ subcarrier cycle was applied directly to PAL-M and PAL-N.
This is likely due to cost considerations.
This results in a strange vertical sync frequency of 50.5027Hz for PAL-N.
This assumption is further supported by a video I found on YouTube that shows the color artifact pattern.
In particular, when using a 227⅓ subcarrier cycle with PAL-N, fixed, annoying color artifacts tend to become more noticeable.
It's thought that using, for example, 228⅚ or 229⅙ with PAL-N, like regular PAL's 284⅙, would reduce color artifacts somewhat. (Similarly, PAL-M uses 227⅙.)
However, PAL-M's 227⅓ seems to reduce rainbow cross color more than NTSC. It doesn't seem to reduce pixel interference.

[Charizard700]

This is a simple simulation that uses color burst phase to recreate the chroma dots of the NES/Famiclone.
Apologies if I'm wrong.

n⅓ NTSC
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n⅓ PAL-M
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n⅙ (NTSC-4.43)
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n⅙ PAL
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[Charizard700]

This is a bit off topic, but
One thing you often see on YouTube is changing PAL-N to "PAL-N 60" using a PPU that can switch 50Hz/60Hz. The vertical sync is probably 60.14Hz.
However, on some TVs, the automatic switching function may get in the way and the image may not be displayed properly.
The fact that the color subcarrier frequencies of NTSC, PAL-M, and PAL-N are "slightly" different also complicates this discussion.
PAL-M 3.575612MHz (21.453671MHz)
NTSC 3.579546MHz (21.477272MHz)
PAL-N 3.582056MHz (21.492338MHz)
This means that individual combinations of color subcarrier, NTSC/PAL, 60Hz/50Hz are possible if the TV can interpret them.
PAL 4.43362 (26.60172MHz) typically has no subtle differences in the color subcarrier. Therefore, the following formats are possible:
PAL, "PAL 60," "NTSC 50 4.43," "NTSC 4.43."
Since "PAL-N 60" famiclones were possible,
it seems possible to create "PAL 60" famiclones as well, but this modification is not widely known.


P.S.
I found information about PAL-60-4.43 (PAL-60).

Interesting PAL/NTSC famiclone
viewtopic.php?t=15828

I found a video on YouTube, but it's difficult to distinguish between PAL-60-4.43, PAL-N-60, and PAL-M.

Also, when a PAL color signal is decoded as an NTSC color, the screen appears blue-purple and yellow (U signal only),
and when an NTSC color signal is decoded as a PAL color, the original green parts turn vermilion. In Argentina, this is apparently called "autumn leaves" or "autumn colors."

[Charizard700]

We should also mention SECAM.
The Dandy Classic's SECAM master clock appears to be 21.312516MHz.
The vertical sync frequency is estimated to be 50.08Hz.

The Hong Kong Famicom's master clock also appears to be 21.3125MHz. That's very interesting.

Hong Kong version Famicom clock frequency is 21.3125MHz
viewtopic.php?t=5358

[lidnariq]

21.3125 MHz = 4 (number of clocks per pixel) x 341 (number of pixels per scanline) x 15625 (EuroPAL + SECAM hsync rate)

What I don't know is whether the TA-09 and UM6559 expect their input clock to be 21.3125 or something else.

We've since learned that the UM6559 emits SECAM as a kind of wikipedia:Direct digital synthesis , constructing triangle waves at the desired frequencies for SECAM color by means of a wikipedia:Numerically controlled oscillator.

[Charizard700]

21.3125 MHz = 4 (number of clocks per pixel) x 341 (number of pixels per scanline) x 15625 (EuroPAL + SECAM hsync rate)

What I don't know is whether the TA-09 and UM6559 expect their input clock to be 21.3125 or something else.

We've since learned that the UM6559 emits SECAM as a kind of wikipedia:Direct digital synthesis , constructing triangle waves at the desired frequencies for SECAM color by means of a wikipedia:Numerically controlled oscillator.

I learned about "direct digital synthesis" and "numerically controlled oscillators".
Thank you.

[Tetsujin28]

Here's a fair UA6548 PAL-M capture through a RetroTink 5X.

[Charizard700]

Here's a fair UA6548 PAL-M capture through a RetroTink 5X.

This is a very good and interesting capture.

[Charizard700]

The Argentine forum is amazing.

Modificacion Pal-N 50HZ a 60HZ (PAL 60)
https://www.retrogaming.com.ar/forum/vi ... &start=770

The Russian forum is also interesting.

Dendy Classic SECAM (Прочитано 84336 раз)
https://www.emu-land.net/forum/index.ph ... 0.240.html

[Charizard700]

There also appears to be a secam famiclone with a strange PAL-SECAM converter.
This one seems to have a PPU that produces a signal closer to PAL-N rather than standard PAL.

Micro Genius IQ501 - console with PAL to SECAM converter
viewtopic.php?t=21204