hello this circuit http://nootropicdesign.com/ve/downloads/LM1881.pdf separate sync signals from composite video,it may help you with some level adjustement,to apply your composite video to vga screens maybe you can find commercial products on ebay but it will be more expensive .... best regards alain Nierveze Le 15/01/2016 12:39, Martin.Hepperle at dlr.de a ?crit :

Please don't use paragraph-length lines. Any monitor that takes DE-15 ("VGA") or DVI-A input is, electrically speaking, taking R-G-B signals; passive adapters exist (I've seen them others exist). (Be careful with DVI; there are at least two kinds of DVI, and it's just DVI-A, AIUI, that fits this description.) Interpolation is not unavoidable. The better flatscreens have a way to tell the monitor to letterbox rather than scale signals whose resolution is less than the monitor's. _Good_ flatscreens have an option to scale by the largest _integer_ factor possible, thus getting image size without losing sharp pixel edges or aspect ratio. (It's depressing how advances in monitor technology have improved things to the point where monitors routinely refuse to do what pretty much any CRT monitor from decades past would.) /~\ The ASCII Mouse \ / Ribbon Campaign X Against HTML mouse at rodents-montreal.org / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B

On Fri, 15 Jan 2016, Martin.Hepperle at dlr.de wrote: I don't know what the preferred way is, but as long as voltage levels are compatible (which I suppose could be tweaked with some circuitry anyway) you might be able to track down a standard VGA monitor that does sync on green and also has an option to switch to the greyscale mode. That's what I've been doing with a TURBOchannel MX monochrome graphics adapter which outputs an analogue composite 1V p-p signal (0.7V video, 0.3V sync), 1280x1024 at 72Hz, on a TNC connector (the adapter is a pile of weirdness of its own BTW). I have wired it via a TNC to BNC adapter and then a 5xBNC to DE-15 adapter (both off the shelf) to the green input of the monitor (obviously 4 of the 5 BNC inputs are loose), and in monitor configuration I chose the greyscale mode with input from the green line. It works just fine, and obviously there's no interpolation involved as the monitor simply applies the single signal to all the three colour components. It seems that with the switch to LCD panels sync on green support has become more common than it used to be with CRT displays; I don't know if this has to do with input circuitry commonly used with them or is it just that I've been lucky though. If you were happy with a green rather than white image (which would certainly add spice to the vintage look of the system, as a green phosphor was not uncommon in the old days), then any sync-on-green display should do. HTH, Maciej