CurtPalme.com Home Theater Forum

[noos@xp37+]

Hey addicts,

it was nice getting the notification about this thread being active again. In the past months, I managed to visit commercial cinemas and home cinemas a few times. One hand would be sufficient to count all events. Very nice social activities, that were lacking the visual fidelity of CRT blacks and motion. I decided to come back to hc when there is time for more than plain breathing (summer?!). I am currently building a Win10 based Pc for the new Oculus (that I expect soon). Hopefully I will manage to bring a CRT to Berlin until summer, when I will rent a car.
Then I will and can hassle with WIN10 and resolutions, but I prefer an other working solution for resolutions beyond 1920 horizontally and unlimited interlaced resolutions vertically. I described this here:


http://www.curtpalme.com/forum/viewtopic.php?p=443652&highlight=#443652

“Gentleman,


when I have time in winter, I will set up a PC based 4K Interlacer and 3D format converter. I did the same a while ago for the fist Oculus Rift. As you can see from the videos , I also was able to convert in "real time" 3d framepacked and protected outputs via products known to us here - to the format need by the Oculus Rift. I did shorten the description a while ago.

http://www.mtbs3d.com/phpBB/viewtopic.php?f=140&t=18494


The logic now is to use one 4k source and run it into a PC that is equipped with a 4k capture card. As you know from the past, the HDCP problem is solvable. The PC capturing the 4k input does preview in real time with super low latency. The preview resolution can be altered in the graphic card menu on the capture PC. So when using old 7xxx series GPUs for interlacing ( like I identified in the past) in the capture PC – you will be able to interlace all inputs. You will also be able to input high end gaming sources, and interlace them with low latency in the capture/playback PC.

I will do this in winter, but maybe someone wants to do it before me.”




Those 7xxx cards work perfect for allllll kind or resolutions and interlaced ones. You can use Win7 for the capture PC and run through it any OS or source and interlace it. Edit: You can use a 1080p capture card for first attempts. I used Blacmagic Intensity pro.

Just my first and time limited thoughts

Marc

...if you want to test resolutions now and fast. Use a WIN7 PC with a 7XXX Nvidia card directly, plus all sources and patterns you can run through it.

[Francisco]

I just did a bid on a Nvidia 7950GS dual video card for € 20,-
Will solder a 5bnc breakout directly on it's DVI analog output. Will see what the Barco is capable to lock onto.

[noos@xp37+]

I would like to see how you solder the BNCs to the card. I can remember some modder cards that had this, but would like to do it myself in the future.

[cmjohnson]

Is there any definitive guide or set of rules defiining which nvidia cards can be pushed into UHD territory by this method?

I'd hate to spend any money on a card that, as it turned out, can't do it.

[noos@xp37+]

This guide need to be written, but the topic need to be explored first with all generations of cards.


I found out that 7XXX card do not have resolution limitations and do interlacing (as far as I remember by hardware/a chip!). Nevertheless you need to be good in using tools, as Nvidia does not want kids to ruin screens with their cards. You can get 7XXX card on flea marks for cents or on ebay for a buck (a low number with passive cooling will do it). I can not offer a cheaper or easier solution.

No newer card I tested did that. Maybe 6XXX and 5XXX series cards will do it as well. But who cares about this AGP stuff.

[thewolfman]

https://en.wikipedia.org/wiki/GeForce_7_series

[cmjohnson]

The only "high end" Nvidia card I have is a GTX 285. I wonder what it'll do?
My guess is that this isn't going to do any UHD resolutions.

Time to start shopping for a 7xxx series card

[gjaky]

[AnalogRocks]

7xxx series cards are all over eBay for $30 USD

[AnalogRocks]

7xxx series cards are all over eBay for $30 USD

[Francisco]

Guys I must say, I only try this for fun. 4k alone isn't that much of an improvement in PQ. HDR will be for sure with it's wider color gamut and EOTF. Unfortunate our beloved CRT won't be able to produce enough light nor capable to produce wider color gamut. Also I think 1080p is actually the right sweetspot for a well tuned Barco 909 or VDC 95XX
Maybe we can tweak a bit on resolutions and go higher but I think scanlines will overlap pretty quick and will affect ansi contrast and sharpness. Also bandwith becomes a problem.
So that you guys know I try these resolutions just for fun and to see what max. Capabilities on the 909. Other than that I will stick to 1920x1080p@72hz and still have a very reasonable 1on1. When time comes and 4k HDR is randomly available, it will be replaced with a digital pushing 4K HDR and 1000nits. Very different balgame....

[cmjohnson]

My position is that there is room for meaningful improvements to the performance of the best CRT projectors, the Marquee chassis
in particular due to its already existing modifications market.

By cleaning up the power and making the HDM and VDM more stable, we can improve spot size.
By using better focusing systems, we can also improve spot size.

By using improved video drive circuitry, we can put the extra sharpness to good use.

By using improved tubes (LUGs over LCPs, for example) we can also gain sharpness.

Interestingly, I think that the hardcore gamer's market might be where a heavily modded projector might make
its last stand, because its persistence and latency is practically zero.

[Francisco]

Breakout cable 5 BNC directly on VGA output onboard videocard.

[Francisco]

Paging Dr. Noos

Marc, do you have porch timings of your resolutions that locked with the Marquee?
It seems that the Barco is very picky on higher resolutions. Most time it won't lock. Maybe I better ask any Barco 9" user if they tried to get the Barco to lock on resolutions above 1920x1080p. I managed to get it to work on 2500x800p@60hz. and sometimes it locks onto something like 3200x1600i @48hz but image is very distorted. I will try again soon with a pci-E card geforce 7950GS.

[thewolfman]

Would you mind drawing big pointy arrows where every cable goes?

[Francisco]

check: http://www.blogcdn.com/www.engadget.com/media/2006/11/vga_pinout.jpg

[thewolfman]

I'm merely curious that's all, but thanks. If there was a cable that one could buy, so not to have to solder, I'd might buy a cheap card and try on my stock VIM 02 as my VIM 03 hasn't got BNC input anymore. Interested in seeing how it all looks. 30-40$ for a card + another 15 for a cable.

[cmjohnson]

Google image search "DVI pinout" and you'll have what you want.

[noos@xp37+]

Hello,

and sorry for being late. I do not have internet at home and I mostly write from trains or buses - traveling between Berlin and Munich.

I have two GTX280s, so that generation is def. out. Do not waste you time with newer cards than the old 7XXX cards. I used 7900GTX cards - but only because I needed them for stereoscopic use in XP. These are the fastest cards for the old and free Nvidia 3d drivers. No sli rendering possible for 3d with these drivers!

Francisco, a very nice mod. Where did you get the PC case part with BNC ports? Filling not used PC casing slots with analog BNC ports is very attractive to me. In fact: SEXY!

About the timings...I am guilty of not doing one thing when realizing the resolution tests. My Marquees scanned pretty much everything above 37hz. So when I tested those dozens of resolutions and refresh rate combinations, I only cared for a clean scan with minimized blankings - to save bandwidth for the lens resolution test itself (and spot size). SO, I did not care if the tubeface was fully filled or "over-scanned". So I can not offer timimgs.

But, I recommend using a high scan CRT monitor for the test. By doing so, you can ensure that you really generate the resolutions/refresh rates in interlaced or progressive versions. Save those and then connect your Barco. If he can not scan the confirmed resolution - alter that saved resolution. Interlacing and the active resolution will stay saved, while you alter only the blankings until “he” scans! (I should write “it”and not “he” - but I think you guys understand)

barclay might remember, when we did a very short resolution test with his HD10L lenses and a movable screen, that you can identify interlacing only by observing desktop letter size - in combination with the scan data of you projector. In other words: If you try to do UHDi, your desktop letters have to be insanely small, while your scan must be 1080p at level and your refresh rate must be consisting with the chosen one for the interlace format. I have observed entering a 72hz interlaced resolution and getting a 60hz i or p version of it. That´s why you need tools in many cases.

My prefered combination:

1: Refreshlock (great great great)

2: (additionally!) CRU


Nice to see this topic getting attention. But please understand I am out of it and out of CRT projection for a while. I am not certain with all points of it. But I will come back and continue where I left! In fact, I am looking forward to it!

[cmjohnson]

Getting blank card slot covers is easy. Using a properly sized sheet metal hole punch for the BNC connectors is also easy,
but the punch costs a little bit.

It's easy to do this mod yourself if you can't find the slot cover with the BNCs already installed.

[noos@xp37+]

Thanks! Using your keywords, I could find that post very easy:

http://www.overclock.net/t/1478442/expansion-slot-cover-with-bnc-fittings

Buying a slot cover "ready for action" would be even more nice....