OSSC Pro as DAC

[shmupsrocks]

I'm struggling to get any of my four HDFury (Nano, 1, 2, 3) DACs working properly. I'm using a MiSTer into DAC into S-Video adapter into consumer CRT. I suspect the S-Video adapter is expecting RGBs but is getting RGBHV, but I'm not sure.

I was thinking I could get an Extron RGB to manipulate the sync signal but I wonder if it would be better to get a more flexible DAC. Can the OSSC Pro be used that way? Is there a better choice?

[Guspaz]

Wouldn't it be easier to use one of the mister analog I/O boards? One of the ones that supports s-video if you need that.

[shmupsrocks]

It would but I can't use an analog I/O since I'd like to have dual SDRAM even though it isn't required by many cores right now.

[Guspaz]

There are analog I/O boards available that support dual SDRAM, as long as you're willing to sacrifice the ability to output HDMI and analog video at the same time (you can switch between them but not simultaneously)

[shmupsrocks]

I hadn't heard of that. Do you know the name of one?

[strayan]

If you need to convert RGBHV to svideo you can use something like this https://antoniovillena.com/product/vga- ... e-s-video/

[shmupsrocks]

That device says to set composite_sync=1 on the MiSTer so I would think it doesn't work with RGBHV.

[Guspaz]

I hadn't heard of that. Do you know the name of one?

The IO Direct (https://misteraddons.com/products/mister-fpga-io-direct) is one such example. May be the only example, not sure.

My understanding is that, to free up the second GPIO header for SDRAM, it sends direct video over an HDMI coupler instead of the GPIO header.

[shmupsrocks]

That is impressive. The only drawback I can find:

"Leaves both RAM slots open with a small tradeoff of replugging the HDMI bridge each time you wish to change displays (small price to pay)."

Do you think changing displays means switching from analog out to digital out since they don't work simultaneously? I guess you're supposed to leave the bridge plugged in if you're using analog out and you unplug it to connect your HDMI display?

[Guspaz]

The bridge is a little u-shaped HDMI coupler that connects between the de10 nano HDMI port and the add-on board's HDMI input. Since the de10's only HDMI output port is taken up, you have to pull the coupler off to plug something into the HDMI port.

I suppose it is theoretically possible to connect an HDMI splitter instead, and connect the HDMI output to a scaler that supports mister direct video mode, like the RT4K, but you'd need to be very careful that the splitter passes the custom metadata that mister DV1 mode uses.

[BuckoA51]

To answer the original question yes OSSC Pro with extra AV out has an option to use either RGBHV or RGB and composite sync, this can be toggled in the menus.

Kind of overkill though unless you need any of its other features.

[orange808]

Wouldn't a splitter drop the signal and resync every time the output signal changes?

[Gara]

I'm struggling to get any of my four HDFury (Nano, 1, 2, 3) DACs working properly. I'm using a MiSTer into DAC into S-Video adapter into consumer CRT. I suspect the S-Video adapter is expecting RGBs but is getting RGBHV, but I'm not sure.

I was thinking I could get an Extron RGB to manipulate the sync signal but I wonder if it would be better to get a more flexible DAC. Can the OSSC Pro be used that way? Is there a better choice?

What S-Video adapter are you using? There are a lot of us using HD Fury 3's and 4's and they are outputting RGBs just fine with Direct Video on the MiSTer. Are you sure you don't have it the other way around where your S-Video adapter is expecting RGBHV and it's getting RGBs?

While I don't use s-video, from what I understand you would need something like these devices linked below to get S-Video on a MiSTer with Direct Video HDMI going into an HDFury 3. I would pursue this route before going to the extreme of using an OSSC Pro as a DAC.

https://ultimatemister.com/product/mike ... ive-board/

https://www.ebay.com/itm/174151197805

[shmupsrocks]

Here what I'm using for S-Video:

https://www.ebay.com/itm/325527354295

I'm going to try manipulating the sync signal with an Extron RGB to see if I can get any of the HDFury DACs working. I have the 1, 2, 3, and Nano and none of them produce a stable picture through the S-Video adapter. The Vention AG6200 DAC works perfectly with S-Video.

[BuckoA51]

Based on the sales listing that adapter is expecting composite sync, so some sort of sync combiner should do the trick for you.

[strayan]

That device says to set composite_sync=1 on the MiSTer so I would think it doesn't work with RGBHV.

Apologies, I didn’t notice that, but you are correct it doesn’t combine H+V sync. It does seem to require 5v on pin 9 though. How is yours being powered?

https://www.cathoderayblog.com/how-to-g ... o-villena/