ChildOfCv Posted August 16, 2019 Share Posted August 16, 2019 All this added bloat for... 8 colors? Note: This is preliminary. Now to take a break before my head finishes exploding. 2600SECAM.pdf Quote Link to comment Share on other sites More sharing options...
roots.genoa Posted August 16, 2019 Share Posted August 16, 2019 (edited) You really don't need to feel sorry for us. SECAM provided an excellent picture quality. Edited August 16, 2019 by roots.genoa typo Quote Link to comment Share on other sites More sharing options...
+Andrew Davie Posted August 16, 2019 Share Posted August 16, 2019 (edited) SECAM could look good... if you really tried.... Edited August 16, 2019 by Andrew Davie I edit stuff just so you wonder what I changed. Quote Link to comment Share on other sites More sharing options...
Electric-Dreams Posted August 16, 2019 Share Posted August 16, 2019 42 minutes ago, roots.genoa said: You really don't need to feel sorry for us. SECAM provided an excellent picture quality. Yes indeed SECAM was a good system. But look at the poor Atari VCS Secam system implementation ! The Atari 2600 games were so colorfull, but i played them during my childhood only with 8 (bad) colors ... 8 Colors vs 106 on PAL VCS !!! ? Atari VCS and games sales would have been better here in France with a good implementation of SECAM. Today I play only with good German PAL 2600 consoles Quote Link to comment Share on other sites More sharing options...
Supergun Posted August 16, 2019 Share Posted August 16, 2019 The French got a better ColecoVision though. They got SCART connectors on those consoles. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted August 16, 2019 Author Share Posted August 16, 2019 4 hours ago, Supergun said: The French got a better ColecoVision though. They got SCART connectors on those consoles. Unfortunately, I have yet to track down a SECAM CV console for a decent price though. Of course that would also include international shipping, so that probably limits the possibilities. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted August 16, 2019 Author Share Posted August 16, 2019 It's too bad they didn't use the digital color output as is. They could actually have included the entire palette by shifting the output of the color from the TIA into a shift register and taking a reading at proper intervals to recover the original digital color value. Then it's just a matter of RGB conversion and mixing with luma to create shades of each color. You'd still need the delay pot adjusted properly, just like for output to PAL or NTSC. But it could probably be made to work. Quote Link to comment Share on other sites More sharing options...
Video Posted August 18, 2019 Share Posted August 18, 2019 Remember many computers (that had color) were 8 color even into the mix 80's ? I love emulation and the fact you can opt for ntsc, pal, or even secam. It's fun to see the differences. And optimized, we can can look great. While the ntsc Atari can show the entire palate at once, most games really stick to half a dozen or so total colors. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted August 22, 2019 Author Share Posted August 22, 2019 Here's pass 2. I corrected a wrong connection and added some missed components. Now includes a PDF with the component locations called out. 2600SECAM.zip Quote Link to comment Share on other sites More sharing options...
Shawn Posted August 22, 2019 Share Posted August 22, 2019 On 8/18/2019 at 6:23 AM, Video said: Remember many computers (that had color) were 8 color even into the mix 80's ? I love emulation and the fact you can opt for ntsc, pal, or even secam. It's fun to see the differences. And optimized, we can can look great. While the ntsc Atari can show the entire palate at once, most games really stick to half a dozen or so total colors. Yeppers, CGA was a wonderful thing....at the time. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted September 2, 2019 Author Share Posted September 2, 2019 And one more update. I filled in the capacitor values that weren't visible without removing them to inspect and/or measure. I also made a guess on the value of the RF tuner coil. I couldn't measure it because some cro-magnon had already shredded the tuning slug that was in it. Apparently the slug itself carries most of the inductance of a tuning coil. So instead I calculated it based on broadcast to the first channel on SECAM VHF at 30MHz. 2600SECAM.zip Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted October 21, 2019 Author Share Posted October 21, 2019 So, for those with working SECAM units, what channel does it broadcast on? 3? I've heard that there are some versions that broadcast on UHF, but the final output modulator on this rev 7 board is only good for low VHF range, according to its datasheet. I'm asking because my multisystem TV uses a fine-grain tuner that can tune in even when the signal is not on a proper frequency, so that gives me two degrees of freedom. But the output filter on the RF is likely tuned for one specific channel and is supposed to remove noise in that range, so if you're not at least in the ballpark you'll probably never get a good output signal. And to complicate matters even more, I had to replace the tuning coil since its ferrite slug was disintegrating, and I don't know the intended range, so I just bought a few different ones. Had to replace the processor socket since an address line wasn't making good contact, and now it at least runs larger cartridges. But even B/W mode shows a lot of interference, and sound effects completely screw up the screen. Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted November 1, 2019 Author Share Posted November 1, 2019 Uh.... success....??? But the sheep is black... and the girders are green? Well, Blueprint seems to look like its picture at least. Quote Link to comment Share on other sites More sharing options...
davyK Posted November 1, 2019 Share Posted November 1, 2019 Did France get an RGB 7800? Quote Link to comment Share on other sites More sharing options...
Mikebloke Posted November 4, 2019 Share Posted November 4, 2019 On 11/1/2019 at 10:44 AM, davyK said: Did France get an RGB 7800? No I dont think so , but there is a lot of mod information for SECAM 7800s on a Google search. Quote Link to comment Share on other sites More sharing options...
emmanuelf Posted November 4, 2019 Share Posted November 4, 2019 (edited) France get standard Pal 7800 with integrated RGB converter as an addon card (not a verry good one for today standards) and without the modulator. There is some pictures in the 7800 topics. Edited November 4, 2019 by emmanuelf Quote Link to comment Share on other sites More sharing options...
ChildOfCv Posted November 6, 2019 Author Share Posted November 6, 2019 Well, one (probably last) update to the schematic. I added the 5 apparent test points that are accessible from holes in the RF shielding underneath, and also corrected some descriptions of various circuits. 2600SECAM.zip 2 Quote Link to comment Share on other sites More sharing options...
emmanuelf Posted November 6, 2019 Share Posted November 6, 2019 ? Thank you Quote Link to comment Share on other sites More sharing options...
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