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Piotr D. Kaczorowski

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Posts posted by Piotr D. Kaczorowski

    NTSC core for VBXE?

    in Atari 8-Bit Computers

    Posted

    51 minutes ago, woj said:

     It was also at this point I realized that occasional shakes on my LCD TV

     

    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.

     

     

     

    VBXE 80 Column Display for Atari Basic

    in Atari 8-Bit Computers

    Posted

    2 hours ago, mmoec said:

    Apologies if this topic has been beat over the head time and time again, but I did try searching the forums and the internet (and I'm no genius at navigating websites) and was able to get bits and pieces of information, but not enough to put together a plan and get this thing done.

    I recently installed a VBXE into my 8-bit Atari, and I would like to be able to program BASIC in 80 column mode, but there appears to be a shortage of information on how to achieve this (again, my web navigating skills could use some fine tuning). I did read something about SpartaDos X and some drivers that may need to be installed, but I can't find anything specific. Perhaps someone could be kind enough to point me in the direction of some clear cut instructions on how to make this a reality? Your help in this would be most appreciated.

     

    Thank you, and good evening.

     

    P.S...this machine also has a U1MB board installed, if that helps any.

     

     

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

     

    A8PicoCart - UnoCart on a Raspberry Pi Pico

    in Atari 8-Bit Computers

    Posted

    2 minutes ago, E474 said:

    The idea is to use the second Pico (the Pico W) to drive the SIO bus, I assume you would need to hook up the +5V SIO line to the Pico (not sure of this though).

     

    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.

     

     

    2 minutes ago, E474 said:

    I think the Ultimate Cart also drives the SIO bus, so the idea would be the same as this.

     

    AVG Cart ?

     

    A8PicoCart - UnoCart on a Raspberry Pi Pico

    in Atari 8-Bit Computers

    Posted

    1 minute ago, E474 said:

    Hi @Piotr D. Kaczorowski,

     

       It was this comment - I'm assuming that if you hooked up the SIO bus to the Pico W, you would have to hook up the +5V SIO line to the VSYS pin on the Pico W (which would be also connected up to the VSYS pin on the Purple Pico, and the +5V line on the cartridge port - I'm really not clear on whether the +5V SIO line actually needs to be connected up though. I assume SIO ground would absolutely have to be connected though. Unfortunately I have a fairly week grasp of the hardware/electrical side of things.

     

     

    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.

     

    A8PicoCart - UnoCart on a Raspberry Pi Pico

    in Atari 8-Bit Computers

    Posted

    @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.

    NTSC core for VBXE?

    in Atari 8-Bit Computers

    Posted

    2 minutes ago, Stephen said:

    Hmmmmm - details on why there's a new version?  Just a change due to supply chain issues?

     

    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.

    • Like 1

    NTSC core for VBXE?

    in Atari 8-Bit Computers

    Posted

    10 minutes ago, wildstar87 said:

    Hmm, based on this, it sounds like I should just make a small sync stripper circuit to do it correctly.  But for simplicity's sake, the voltage divider would be quicker.  I'm assuming 2 resistors in series running from Csync(4050) to GND, with  Csync (OUT) tapped in the middle.  What resistors would you suggest?  You mention 0.3v, but I've also seen 0.7v or 1v mentioned in the Csync discussions I've seen.

     

    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 :)

    NTSC core for VBXE?

    in Atari 8-Bit Computers

    Posted

    2 minutes ago, wildstar87 said:

    Hmm, based on this, it sounds like I should just make a small sync stripper circuit to do it correctly.  But for simplicity's sake, the voltage divider would be quicker.  I'm assuming 2 resistors in series running from Csync(4050) to GND, with  Csync (OUT) tapped in the middle.  What resistors would you suggest?  You mention 0.3v, but I've also seen 0.7v or 1v mentioned in the Csync discussions I've seen.

    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.

    NTSC core for VBXE?

    in Atari 8-Bit Computers

    Posted

     

    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

    NTSC core for VBXE?

    in Atari 8-Bit Computers

    Posted

    1 minute ago, electron said:

    I'm using retrotink 5x with VBXE 1.1 ... since yesterday to be honest. No problem at all, but I don't remember what I have connected as csync ... probably digital 5V CSYNC from 4050 through resistor in series, but i would have to check.

     

    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).

     

     

    HAVO - (Micro) HDMI Atari Video Output - Coming to market in the fall of 2023

    in Atari 8-Bit Computers

    Posted · Edited by Piotr D. Kaczorowski

    13 minutes ago, Havok69 said:

    Would that be the possible final price for the complete package, or do we need to purchase a VBXE separately as well?

    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.

    NTSC core for VBXE?

    in Atari 8-Bit Computers

    Posted

    11 minutes ago, -^CrossBow^- said:

    I finally got this to work but it required some very specific stuff to do it.

     

    First is that the ONLY spartados image I've found to work is the one from Brewing Academy's tnfs server. But even then, I had to copy it onto the SD card as just loading it via wi-fi wouldn't seem to work. That got Spartdos loading up. I then have to load up @Piotr D. Kaczorowski atr file that has the FC.COM and XBF config files in it to another slot on the FujiNet. From there I switch drives once Spartdos loads and run the FC.com and everything works as expected now. When I use @tebe's ATR, I can get the FC.com to load up, but then all of the info in the program is essentially blank and doesn't seem to 'see' my VBXE. While the FC.com from Piotr's does. No idea why that is...but there we go.

     

    I've got the NTSC palette showing now through my VBXE and the game RGB finally looks correct!

     

    So yeah it was a bit of a trial for me but I got it.

     

    I'm glad I could help :)

    NTSC core for VBXE?

    in Atari 8-Bit Computers

    Posted

    2 hours ago, syscall said:

    Dude, if you called his workplace to find and contact him, you are seriously spooky and I'd keep away from you.

    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.

    • Like 2
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