Piotr D. Kaczorowski

I have the same!!!! Nobody believed me! This issue has been addressed in the new SAVO rev.2 and related family boards with a small circuit. It pertains to the internal noise of the Atari and external reverse noise from the cable to the TV.

It hasn't been a week since the NTSC core for VBXE appeared and AtariAge was sold... Coincidence? I don't think so

I think @drac030 might be able to help with this.

@E474, As you know, we are just a front-end interface for ChatGPT-4. :))))

You should connect it to the same +5V source from the cartridge port. If you wish to add extra stability, you could include an additional 220uF capacitor on the +5V line. AVG Cart ?

I guess I don't know what you want to do. After all, you already have power and ground on the cartridge. If you start connecting these things additionally, you will certainly get what is known as a ground loop, which may increase noise.

@E474, Several people are working on some solutions that will soon be published. You certainly have interesting ideas. However, I don't know why Freddie would be the one to get damaged specifically. You could probably damage various other things as well. As for power separation, this topic has already been preliminarily discussed. You can also look at the Fujinet schematics to see how external power has been handled, which is needed for Fujinet in the case of the 1200XL, where there is no power on the SIO.

@E474, Masterpiece

This month, I will be placing some orders with JLCPCB, so I will also have the A8PicoCart

Well, I'm not really sure. I believe they are the same, and he also stated on Facebook that they are the same. In fact, I have some of those boards at home, including at least two revisions of version 2.1, each with different RAM on it. I've also noticed slight variations in the R-2R DACs. So, there may be some minor differences.

Try a 300R resistor to start with. It should be fine. I am a functioning perfectionist and am working on developing a final solution at an entirely different level, also needed for generating S-video, CVBS, and Component Video and finally HDMI. If you don't have a voltage divider, you will also load the 4050 circuit itself. This circuit is simple, so if it has a low-quality cable that becomes an antenna, you will experience reverse noise that will also affect the power stabilization of the 4050. It's a bit of magic, but that's how it is

I've sold almost 200 of these SAVO boards already. There have been no reports of any issues, but (!!!!) at home, I have a 20" Panasonic Viera TV, my favorite, which is very sensitive to synchronization. No sync striper helps. I've already built a circuit and it's in the final stages of testing, so if everything goes well, it will simply be on the SAVO rev2 board. For now, I've managed to get it down to even 140mV, while it still picks up something when connected from various +5V points on the main board. In any case, it's in the testing phase. The lower limit is 300mV. It shouldn't really go any lower. What should the size be? The smallest! Because CSYNC is a pure square wave signal, and such a signal in a Fourier series is an infinite number of sine waves that approximate it. Therefore, the larger the amplitude, the more hum you'll have on the audio and the more interference you'll have on the image.

The new SAVO boards will feature a small circuit designed to filter the SYNC signal in two stages: first by removing noise from the Atari, and second by eliminating reverse noise from the TV cable. The objective is to achieve a very sharp, yet noise-free, CSYNC signal at a peak-to-peak voltage of 300mV

As I recall, you could use a 300-ohm resistor, but my recommendation is to opt for a voltage divider. The CSYNC' (Pin #15 on the 4050) is the best source for clear synchronization with a relatively low level of noise (when GND is from VBXE).

In the meantime at Lotharek.pl...

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The HAVO is a separate add-on for VBXE that includes an upscaling module and an RGB-to-digital video converter. It's akin to having a mini RetroTink built into the Atari. I've noticed that the current price of VBXE is approximately 99 USD. I believe HAVO could be bundled with VBXE as a set.

Atari XE or XL ?

You almost gave up :))) Well, let's get to work!

HAVO addon to real VBXE will have Micro HDMI and NTSC artifacting post processing unit.

I'm glad I could help

Look for positives, not negatives. No one has been harmed. Everyone is satisfied. Nobody is bothering anyone either. It's a normal thing. At least here in Poland, it's not a problem, because people are open to the problems of others and helpful. As Electron wrote, people here preferred to talk for 6 years instead of directly asking for help. Anyway, there's probably no need to develop this topic further, as it seems to have been close.

ATR image for SpartaDOS X containing the files fc.com and v2x126a3.rbf. This is basic core with NTSC palette, without 320KB Rambo and for the latest VBXE 2.0 oraz 2.1 boards. Installation verified. Video available on AtariAge Discord in hardware-mods. VBXE2x_FX_v126_core_ntsc_palette.atr

You have the latest VBXE 2.1 version, so the most suitable core file for you will be: v2x126a3.rbf