The online community for MiSTer FPGA enthusiasts
https://misterfpga.org/
I have this one as well but it crushes black and does not support 0-255 RGB Full.shertz wrote: ↑Wed Apr 28, 2021 4:48 am I bought this one and it works fine for me.....
https://www.amazon.com/dp/B01MS611LJ/
Component can work with most of them as long as you mod it according to the MiSTer FPGA wiki article on direct video. I have done the mod (https://github.com/MiSTer-devel/Main_Mi ... pr-signals) by prying open the adapter and connecting the pins as explained internally, on this adapter --> https://www.amazon.com/gp/product/B00SW9JI9A/ - and it wasn't too hard. I use MiSTerAddons.com's VGA to Component cable in conjunction with this.paulbnl wrote: ↑Tue Apr 27, 2021 8:40 pm I have the one from here: viewtopic.php?p=13379#p13379
There appear to be versions with different internals. Someone reported Component was working with Direct Video with theirs but only VGA works with Direct Video on mine.
It has perfect 0-255 VGA output.
The hdmi_audio_96k setting also affects Direct Video.
Just FYI that DAC has no audio out.aberu wrote: ↑Wed Apr 28, 2021 2:35 pmComponent can work with most of them as long as you mod it according to the MiSTer FPGA wiki article on direct video. I have done the mod (https://github.com/MiSTer-devel/Main_Mi ... pr-signals) by prying open the adapter and connecting the pins as explained internally, on this adapter --> https://www.amazon.com/gp/product/B00SW9JI9A/ - and it wasn't too hard. I use MiSTerAddons.com's VGA to Component cable in conjunction with this.paulbnl wrote: ↑Tue Apr 27, 2021 8:40 pm I have the one from here: viewtopic.php?p=13379#p13379
There appear to be versions with different internals. Someone reported Component was working with Direct Video with theirs but only VGA works with Direct Video on mine.
It has perfect 0-255 VGA output.
The hdmi_audio_96k setting also affects Direct Video.
Most likely in the worst case the DAC might not output audio.
You seem have the assumption that DACs should output a pedestal with limited range which is wrong. If the DAC properly supports Limited range then 0-255 and 16-235 will result in the same mV output.Kuro Houou wrote: ↑Thu Aug 25, 2022 2:38 am Thought I would post this DAC analysis I have been working on here..
https://tinyurl.com/crt-hdmi2vgadacs
Right now I believe there is only one DAC that is truly accurate for the Mister. Based on my analysis only the HDFury3 matches closely to the reference RGB mV levels. DACs based on the AG6200 are the worst, and if you wanted to use limited color space with them you can forget about it. Hopefully this will help some of you. I am continuing my quest for the best DACs for the Mister, so ill keep updating this sheet. But stay away from the AG6200 chip, if you have to use the CS5210. I know the HDFury3 isn't cheap, but I guess you get what you pay for...
I am always open to new information but I am not sure what you are saying here. Limited range by definition has black starting at 7.5 IRE, so if you look at an oscilloscope you will see a pedestal that will show a black signal from the source starting at ~50mV. With a broadcast grade pattern generator set to limited range with RGB you will see a pedestal at that level (can also use a PS3 and a good calibration disk with window patterns). With the Mister set to a lower range of 16, regardless if it is 16-235 or 16-255 that pedestal should be the exact same as defined by the reference specifications, all limited range signals should have black starting above blanking/0mV at +7.5 IRE. If a signal does not have that then it is not using proper limited range specifications. That said on the other side, 255 should be the same, so 0-255 and 16-255 should have the same mV at 100 IRE, which my graph shows within about a 1% margin of error which I’ll accept as my error rate for reading my oscilloscope. But again I am open to learning more, if there is documentation that specifies limited range should not start at 7.5IRE somewhere I am open to researching that.
Yeah that’s the sheet I have been working on building out. Just added the HDFuryX4 to that list today.shertz wrote: ↑Thu Aug 25, 2022 9:58 pm Someone in the MiSTer discord channel posted this...
https://docs.google.com/spreadsheets/u/ ... view#gid=0
Don't know if this helps with your situation.
Most devices including VGA monitors expect a 0-700mV signal. So a HDMI to VGA DAC that processes HDMI Limited Range correctly should map 16-235 to 0-700mV / 0-100 IRE. Otherwise you will just get grey blacks and darker white shades.Kuro Houou wrote: ↑Thu Aug 25, 2022 12:27 pm
I am always open to new information but I am not sure what you are saying here. Limited range by definition has black starting at 7.5 IRE, so if you look at an oscilloscope you will see a pedestal that will show a black signal from the source starting at ~50mV. With a broadcast grade pattern generator set to limited range with RGB you will see a pedestal at that level (can also use a PS3 and a good calibration disk with window patterns). With the Mister set to a lower range of 16, regardless if it is 16-235 or 16-255 that pedestal should be the exact same as defined by the reference specifications, all limited range signals should have black starting above blanking/0mV at +7.5 IRE. If a signal does not have that then it is not using proper limited range specifications. That said on the other side, 255 should be the same, so 0-255 and 16-255 should have the same mV at 100 IRE, which my graph shows within about a 1% margin of error which I’ll accept as my error rate for reading my oscilloscope. But again I am open to learning more, if there is documentation that specifies limited range should not start at 7.5IRE somewhere I am open to researching that.
I have to disagree. A DAC should not be converting anything unless I tell it too (as in the DAC would have to have a toggle for that). If I am sending 0-255, the DAC should pass 0-255, if I send 16-235, pass 16-235. Same goes for 16-255.paulbnl wrote: ↑Fri Aug 26, 2022 5:48 pmMost devices including VGA monitors expect a 0-700mV signal. So a HDMI to VGA DAC that processes HDMI Limited Range correctly should map 16-235 to 0-700mV / 0-100 IRE. Otherwise you will just get grey blacks and darker white shades.Kuro Houou wrote: ↑Thu Aug 25, 2022 12:27 pm
I am always open to new information but I am not sure what you are saying here. Limited range by definition has black starting at 7.5 IRE, so if you look at an oscilloscope you will see a pedestal that will show a black signal from the source starting at ~50mV. With a broadcast grade pattern generator set to limited range with RGB you will see a pedestal at that level (can also use a PS3 and a good calibration disk with window patterns). With the Mister set to a lower range of 16, regardless if it is 16-235 or 16-255 that pedestal should be the exact same as defined by the reference specifications, all limited range signals should have black starting above blanking/0mV at +7.5 IRE. If a signal does not have that then it is not using proper limited range specifications. That said on the other side, 255 should be the same, so 0-255 and 16-255 should have the same mV at 100 IRE, which my graph shows within about a 1% margin of error which I’ll accept as my error rate for reading my oscilloscope. But again I am open to learning more, if there is documentation that specifies limited range should not start at 7.5IRE somewhere I am open to researching that.
Same thing with HDTVs. They will map 16-235 to 0-100 IRE so with a PS3 for example, if you toggle its output between Limited Range and Full Range there should be no difference in dark and light shades.
I added the limited 16-255 output for the AG6200 DACs to get their output closer to linear 0-100 IRE. It crushes the darker shades with Full range input and it is too dark with 16-235.