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Blast! Damn you CRT TV/graphics card!!!
Louis Tully:
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LASmith132:
--- Quote from: Louis Tully on December 03, 2012, 10:58:26 am ---
--- Quote from: LASmith132 on December 03, 2012, 10:45:30 am ---
Could my tv be the problem? 25" Akai CRT TV?
--- End quote ---
When you cycle through your input settings on the tv, is it just a 1 button type of thing? Like a TV/AV or TV/LN1 button or are there options? I ask because the old RCA tv we have connected through S-Video has a setting to select S-Video. I had to go through the tv menu settings and change the Video Input to S-Video, it defaults to an AV setting(composite). I've never seen an Akai tv but maybe it's got a similar type of menu option and needs to be set to a specific input?
Just tossing ideas out there :dunno
--- End quote ---
I will try to cycle through again the choices and put them up here. Could it be that I need the remote control?
ahofle:
--- Quote from: rCadeGaming on November 30, 2012, 07:30:43 pm --- Standard definition TV's can display native arcade resolutions. This means around 240p, which looks worlds apart from 480i. 480i will be blurry by comparison and lack proper scanlines, both due to the scaling.
An SDTV can be set up with MAME to rival the quality of a real 15kHz arcade monitor. Second link in my signature.
Btw, all of these vga to tv converters add input lag because of the scaling.
--- End quote ---
Do you happen to have any links for proper composite transcoders that don't scale? I know a couple people with TVs in their cabinets (no component, only s-video or composite) and this sounds like a huge improvement. Has anyone here had luck running 15khz over composite? That would really open up display options for arcade cabinets.
rCadeGaming:
I'm using a Crescendo Systems TC1600. Not the cheapest, but it's extremely high quality, and lag free of course. It's made by a fellow enthusiast, and he offers excellent service as well, you won't get anything close from a big company. It works for the PC's VGA, as well as RGBS from consoles (SNES, Genesis, pretty much everything).
The whole point of Soft15kHz is running native resolutions. Graphics cards scale everything to 480i on "TV out" ports, so it's not possible.
Read the second link in my signature.
MonMotha:
http://www.jammaboards.com/store/rgb-to-ntsc-pal-tv-converter-pcb-cv-04.html is cheapish. I've not used it, but the chip it uses (it's a Rohm part) is fully analog and should be lag-free. This exact design shows up on ebay under various names other than Wei-ya.
Jrok also has one based on the Analog Devices AD725. I've not used his design, but I built a similar device (with a few other application specific features), and the quality was excellent. I didn't know S-Video could look that good (tested with a Sony Wega).
It's also possible to make an RGB to YPbPr transcoder that's fully analog, though in practice most of them seem to be digital. That can be done with nothing more than ADC/DAC and conversion matrix pipeline lag, though, which is on the order of 20-30 pixel clocks typically i.e. negligible.
You can build an upscaler that's low lag. It won't be totally lag free, but you can get it down to about 2 input scanlines which is short enough that you'll never notice, though it may break light guns. It'll still be scaled, of course, so you'll destroy any pixel perfect graphic features such as scanlines. If you want to do an exact 2:1 upscale (line double) to go from e.g. 15.5kHz CGA to 31kHz VGA, that can be done with exactly 1 scanline of latency, and you can play some tricks with the output intensity to re-replicate the scanlines, though it'll still look a bit different on a PC CRT with tight dot pitch than it does on a TV tube like used in an arcade monitor.
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