Oli Posted November 14, 2002 Share Posted November 14, 2002 Hi, Anyone tried the PAL A/V modifiction from http://www.itstoast.co.uk/atari/? Does it work well? Is it easy to do? Quote Link to comment Share on other sites More sharing options...
tim. Posted December 17, 2002 Share Posted December 17, 2002 dont bother with it it looks even worse than the Benjamin J. Heckendorn mod the author suggests wireing the tia's Vcc into your video signal! if you value your atari dont perform this mod, there are much better ones around. Quote Link to comment Share on other sites More sharing options...
Oli Posted December 23, 2002 Author Share Posted December 23, 2002 Your warning came too late, I did the mod already! The picture quality is excelent! I can confirm my Atari is still working perfectly after about a month of quite frequent use. Do you know of any other PAL A/V mods, maybe I could do a comparison test?! Quote Link to comment Share on other sites More sharing options...
tim. Posted December 23, 2002 Share Posted December 23, 2002 the only difference (as far as your concerned) between the pal and ntsc tia chips are the pinouts pal atari's use the signals LUM0 -- pin 7 LUM1 -- pin 5 LUM3 -- pin 6 where NTSC atari's use LUM0 -- pin 8 LUM1 -- pin 5 LUM2 -- pin 7 a good mod to do a comparison would be the one in the atari 2600 faq (the one with a 4050 buffer and transistor amplifier) or if your atari already has a 4050 in it then try the one I posted in the thread "Atari 2600 video out modification" Quote Link to comment Share on other sites More sharing options...
Oli Posted December 23, 2002 Author Share Posted December 23, 2002 I tried the NTSC mods before and they do sorta work, but PAL carts colours dont look right (thats why I used the mod from Radfoo). Does anyone know of any specific PAL mods I could try? I have a couple of Atari Juniors I could test the mods on. Quote Link to comment Share on other sites More sharing options...
Radfoo Posted December 23, 2002 Share Posted December 23, 2002 I am not aware of any other PAL mods (other than mine) I would be interested to know of any other (correct colour) PAL mods exist? Radfoo Quote Link to comment Share on other sites More sharing options...
tim. Posted December 26, 2002 Share Posted December 26, 2002 Here is a modification I designed, its pretty simple - just amplifies the composite video signal before it gets to the modulator Circuit Diagram it does require a few modifications to the atari itself though. The audio mixing oscillator needs to be disabled (remove R56) and the rf modulator needs to be taken out of the circuit since it pulls the video signal's amplitude down. To do this you can either cut the trace to the modulator or remove two components inside the modulator (R17 and C33) This circuit was designed for a PAL atari 2600jr (yes, the colours are correct) but im pretty sure it will work just as well on an NTSC machine. It will also work for other models of the atari 2600 (and 7800) that have a 4050 chip to buffer the luminance signal -- most ataris have one but some don't eg the "darth vader" model. to locate the components mentioned refer to atari 2600jr schematics Quote Link to comment Share on other sites More sharing options...
Radfoo Posted December 26, 2002 Share Posted December 26, 2002 Looks interesting, i'll perhaps have a go myself. Quote Link to comment Share on other sites More sharing options...
Radfoo Posted December 30, 2002 Share Posted December 30, 2002 Added a comparison picture on my web site between a tuner and the composite mod. http://www.itstoast.co.uk/atari/. Quote Link to comment Share on other sites More sharing options...
TXG/MNX Posted December 31, 2002 Share Posted December 31, 2002 hmm looks good gonna make this mod on one of mine 2600... What is the best system to update: 2600 (wood) 2600 Dark vader 2600 jr :wink: Quote Link to comment Share on other sites More sharing options...
Radfoo Posted December 31, 2002 Share Posted December 31, 2002 Although the mod will work fine in all three, my instructions are for the Junior so this should make things easier for you. Let me know how you get along Radfoo Quote Link to comment Share on other sites More sharing options...
TXG/MNX Posted December 31, 2002 Share Posted December 31, 2002 Although the mod will work fine in all three, my instructions are for the Junior so this should make things easier for you. Let me know how you get along Radfoo Okay I will give feed back on how it works, when it's done maybe I will make this mod also in the other systems I have... Quote Link to comment Share on other sites More sharing options...
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