OSSC Pro

[marqs]

Just curious, will 480p --> 480i conversion will be possible on the Pro?

Yes. You can take a look at currently available output presets here.

[awe444]

Just curious, will 480p --> 480i conversion will be possible on the Pro?

Yes. You can take a look at currently available output presets here.

Thank you

It'd be nice if at least one of the HDMI-inputtable scalers could do it

I just use a simple HDMI->VGA adapter and feed it to an Extron VSC700. It looks fantastic in 480i

Yes, that's a valid solution, as is using an RT5X. But the specific games+setup that will require 480p-->480i are a sufficiently rare edge case for me that I'd rather not have dedicated equipment of any kind in my chain for just this purpose, if another integral device can accomplish it.

[orange808]

Yes, that's a valid solution, as is using an RT5X. But the specific games+setup that will require 480p-->480i are a sufficiently rare edge case for me that I'd rather not have dedicated equipment of any kind in my chain for just this purpose, if another integral device can accomplish it.

I haven't seen the other solutions in action, but the Extron scan converters set a high standard. They have robust flicker filter options that I seriously doubt are implemented anywhere else. Of course, the OSSC Pro project is open source and that could change.

[VEGETA]

nice to see this project moving. I wonder what is the key killer features that differentiate this product from rink4k and morph?

[ZellSF]

None? It's much cheaper, it would be weird if it had one huge feature over its much more expensive competitors, "killer features" is asking for a bit much.

[SavagePencil]

also it's...open source, which is a pretty nice "feature."

[tongshadow]

120hz support and BFI under $350 and GPIO expansion are the key killer features for me.

[Paranoid_Andy]

I believe it is much more arcade and PC friendly as well.

[ZellSF]

It's way too early to tell if that's the case.

[bobrocks95]

Tink 4K PCB testing has been going well from all social media posts I've seen on the matter. Don't know if any particularly problematic PCBs have been tested or not- what's the usual crowd, some Toaplan boards with sync issues, Mortal Kombat and Irem for odd refresh rates?

[orange808]

Off the top of my head, there's some problematic Neo Geo MVS boards, Midway, and Seibu Kaihatsu boards in addition to Toaplan. I'm sure there's plenty more, but those are the ones that I hear about the most.

[bobrocks95]

Artemio just posted a picture of Raiden Fighters Jet displaying properly through the Tink 4K, which digging through old posts on here is 54Hz and has trouble with even some PVMs.

Hopefully the OSSC Pro is also flexible enough to get most everything working.

[fernan1234]

Yes. You can take a look at currently available output presets here.

It's great to see that standard 480i outputs will be available. Now, might it at some point be possible to output interlaced SD but with the same refresh rate as the source? I'm thinking specifically of japanese computers with odd ~56Hz output, it would be amazing to display those on SD CRTs but with the original refresh rate.

[marqs]

Artemio just posted a picture of Raiden Fighters Jet displaying properly through the Tink 4K, which digging through old posts on here is 54Hz and has trouble with even some PVMs.

Hopefully the OSSC Pro is also flexible enough to get most everything working.

Unusual refresh rate is not really an issue since framelock can be turned off, but any sync irregularities can be problematic for video ADCs. I recall Xexex-based PCBs were reported not working with OSSC and some other devices, but I've not been able to debug one to see the exact reason.

Yes. You can take a look at currently available output presets here.

It's great to see that standard 480i outputs will be available. Now, might it at some point be possible to output interlaced SD but with the same refresh rate as the source? I'm thinking specifically of japanese computers with odd ~56Hz output, it would be amazing to display those on SD CRTs but with the original refresh rate.

That's how it already works when framelock is enabled. H/V timings from preset closest to target refresh rate (if multiple exist for same resolution) are selected, and pixel clock with runtime-calculated frequency is generated.

[windaddy01]

Just curious, will 480p --> 480i conversion will be possible on the Pro?

Yes. You can take a look at currently available output presets here.

Is lag free 1080p to 1080i conversion for HD CRTs possible with the OSSC Pro or will it require the OSSC pro to be in scaler mode? if lag free 1080p to 1080i is possible does the OSSC pro already support it right now or will there need to be a firmware update? if scaler mode is required how much lag will there be?

[marqs]

Just curious, will 480p --> 480i conversion will be possible on the Pro?

Yes. You can take a look at currently available output presets here.

Is lag free 1080p to 1080i conversion for HD CRTs possible with the OSSC Pro or will it require the OSSC pro to be in scaler mode? if lag free 1080p to 1080i is possible does the OSSC pro already support it right now or will there need to be a firmware update? if scaler mode is required how much lag will there be?

It also possible to do 480p->480i, 576p->576i and 1080p->1080i conversions in A-LM mode with just a few lines of latency.

[ark125]

The announced GPIO VGA output will be ready for the launch? It will output RGsB for those we use D Series Sony BVMs?

If the GPIO DAC can convert the signal to RGBs, RGsB and RGBHV we can forget about the extron RGsB converters.

2560x1440p --> 2560x1440i conversion will be possible?
https://www.reddit.com/r/crtgaming/comm ... ery_rare/

[kitty666cats]

The announced GPIO VGA output will be ready for the launch? It will output RGsB for those we use D Series Sony BVMs?

If the GPIO DAC can convert the signal to RGBs, RGsB and RGBHV we can forget about the extron RGsB converters.

2560x1440p --> 2560x1440i conversion will be possible?
https://www.reddit.com/r/crtgaming/comm ... ery_rare/

Oh snap, I haven’t heard anything about a VGA GPIO out. That’ll be really cool for PC CRTs (especially higher-end ones)!

[marqs]

The announced GPIO VGA output will be ready for the launch? It will output RGsB for those we use D Series Sony BVMs?

If the GPIO DAC can convert the signal to RGBs, RGsB and RGBHV we can forget about the extron RGsB converters.

I can share design files of the DAC expansion card upon release, but I've not had time to test all its features due to higher priority items. The card uses ADV7125 which can be configured to output sync on green, but e.g. this hasn't been tested. Normal RGBHV works as expected and HV can be trivially replaced by TTL composite sync as they are driven by FPGA.

2560x1440p --> 2560x1440i conversion will be possible?
https://www.reddit.com/r/crtgaming/comm ... ery_rare/

It's possible to output 2560x1440i, but neither analog or digital inputs support 2560x1440p@60, at least officially. 1920x1440p@60 input is more likely to work reliably.

[windaddy01]

Yes. You can take a look at currently available output presets here.

Is lag free 1080p to 1080i conversion for HD CRTs possible with the OSSC Pro or will it require the OSSC pro to be in scaler mode? if lag free 1080p to 1080i is possible does the OSSC pro already support it right now or will there need to be a firmware update? if scaler mode is required how much lag will there be?

It also possible to do 480p->480i, 576p->576i and 1080p->1080i conversions in A-LM mode with just a few lines of latency.

So progressive to interlaced conversion with adaptive line multiplication will be available at launch? also can A-LM convert 720p to 1080i or would the full scaler mode be required to do that? also will the ossc pro properly support full dynamic range as a lot programs on PC only support full dynamic range and won't display correctly when the dynamic range is set to limited?

[awe444]

The announced GPIO VGA output will be ready for the launch? It will output RGsB for those we use D Series Sony BVMs?

If the GPIO DAC can convert the signal to RGBs, RGsB and RGBHV we can forget about the extron RGsB converters.

I can share design files of the DAC expansion card upon release, but I've not had time to test all its features due to higher priority items. The card uses ADV7125 which can be configured to output sync on green, but e.g. this hasn't been tested. Normal RGBHV works as expected and HV can be trivially replaced by TTL composite sync as they are driven by FPGA.

Any chance YPbPr output from the same GPIO DAC will be a possibility? Or if not, a different GPIO DAC for component?

[marqs]

So progressive to interlaced conversion with adaptive line multiplication will be available at launch? also can A-LM convert 720p to 1080i or would the full scaler mode be required to do that? also will the ossc pro properly support full dynamic range as a lot programs on PC only support full dynamic range and won't display correctly when the dynamic range is set to limited?

Line drop mode in A-LM is available on launch but as the name suggests, it can only drop every other line so 720p->1080i conversion is only possible in scaler mode. I suppose your question on dynamic range refers to HDMI input. By default input RGB range is processed according to HDMI metadata, but it's possible to manually set the range in case source does not explicitly state it.

[marqs]

Any chance YPbPr output from the same GPIO DAC will be a possibility? Or if not, a different GPIO DAC for component?

It's possible since FPGA would just need to do CSC. Sync gets embedded into Y just like in RGsB. I've also though about adding support for separate video-level sync in next revision of the expansion card. That way it would be possible to have SCART-RGB output utilizing the same adapter which is used for creating a second SCART/component/VGA input (also requiring a small update to enable this).

[awe444]

This is brilliant, thanks!

Putting all three connector types on one add-on board probably makes the most sense from a production standpoint? Though a lower profile variant with just VGA connector + 3.5 mm could be nice for most signal types if used with dongles or connector-converting cables. Curious what others think about this...

[marqs]

Putting all three connector types on one add-on board probably makes the most sense from a production standpoint? Though a lower profile variant with just VGA connector + 3.5 mm could be nice for most signal types if used with dongles or connector-converting cables. Curious what others think about this...

The expansion card indeed has just VGA + 3.5mm (+toslink). The previous adapter would be for people who don't have suitable cables like below.

[ark125]

Any chance YPbPr output from the same GPIO DAC will be a possibility? Or if not, a different GPIO DAC for component?

It's possible since FPGA would just need to do CSC. Sync gets embedded into Y just like in RGsB. I've also though about adding support for separate video-level sync in next revision of the expansion card. That way it would be possible to have SCART-RGB output utilizing the same adapter which is used for creating a second SCART/component/VGA input (also requiring a small update to enable this).

It wouldn't be easier to create a board with BNC connectors?

In that manner, we will have an all in one solution.
For Ypbpr we would use bnc to rca adaptors.
For RGB over VGA, a BNC to VGA cable.
For RGB over scart, a BNC to Scart cable.

Sorry if I'm being picky. I appreciate your hard work.

[fernan1234]

It wouldn't be easier to create a board with BNC connectors?

In that manner, we will have an all in one solution.
For Ypbpr we would use bnc to rca adaptors.
For RGB over VGA, a BNC to VGA cable.
For RGB over scart, a BNC to Scart cable.

Sorry if I'm being picky. I appreciate your hard work.

You can do literally every one of these things just as well with a "VGA" connector, with the same or even less additional adapters, and it's also cheaper and takes much less space.

[marqs]

It wouldn't be easier to create a board with BNC connectors?

In that manner, we will have an all in one solution.
For Ypbpr we would use bnc to rca adaptors.
For RGB over VGA, a BNC to VGA cable.
For RGB over scart, a BNC to Scart cable.

Sorry if I'm being picky. I appreciate your hard work.

You can do literally every one of these things just as well with a "VGA" connector, with the same or even less additional adapters, and it's also cheaper and takes much less space.

5 BNCs would indeed make the card at least double the width it currently is. It also makes it hard to safely support different sync levels (TTL or 0.3Vpp). You could add an extra BNC or jumper on the board, but in either case some users end up connecting TTL sync to their sensitive equipment and possibiy damaging them. Anyway, one is free to design such PCB if it's more suitable for his/her setup, but mass-producing and selling could be more challenging due to previous reasons.

[marqs]

The boards will go on sale next week at the previously mentioned price of $330 / €310 (+shipping & VAT). Wikipage and other information are going to be published during the next few days.

[Fed]

Congrats on the launch @marqs !

Sync question, does the pro allow to adjust vertical sync width ?
I have an Ikegami 1990r which is a monitor not very tolerant on that point causing some flagging at the top of the picture. I was wondering if the pro (or normal) could help on that point.