Software Support > GroovyMAME

Dual monitor setup questions.

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Milsancho:
Thanks for the incredibly insightful reply, buttersoft! That's all I wanted to know. It's a shame that even DACs have become legacy devices and current options are low-grade substitutes.

The issue with these, as I understand, is just for 15khz use? I'll be safe if the lowest mode I'll need is 480p60 (or 240p120)?

At any rate, I should avoid something like this ("Oldboytech" in the US, I believe):

https://www.amazon.de/-/en/gp/product/B08CW57STX











buttersoft:

--- Quote from: Milsancho on August 06, 2023, 12:17:48 pm ---The issue with these, as I understand, is just for 15khz use? I'll be safe if the lowest mode I'll need is 480p60 (or 240p120)?

--- End quote ---

The makers of these cheaper converters never aimed a product at 15kHz video conversion, no. Further, that one you linked to doesn't even list 480p in its supported resolutions. And when it comes to other dongles/converters i really have no idea. I can only tell you what i've been through and what i found out from it - hence the post above :)

There are going to be more expensive converters out there, old studio or broadcast gear even, i just don't know what to recommend, there.

Milsancho:
So I'm reading quite a bit and I think I'd rather buy another card. The HD 4000 is not recommended for Windows 7 and the HD 6000 has this VGA port with cable:



which apparently is not good.

So a couple of questions, if you bear with me:

- When it's a VGA port like that, does it mean that it's using an internal DAC?

- Does the Display Port also have low dotclock incompatibility when converted to analog?


Though this is somewhat long ago, I've read Calamity that low dotclock incompatibility happens with digital outputs (implying all of them). Must I assume this is not really the case nowadays? I'd be interested in displaying natively 256x240 and the likes, so I'd like to make sure given that what I was dicussing with buttersoft was just '15khz' compatibility.


Edited to add: Nevermind the second question as I think I got the answer. DP itself is not problematic with low dotclocks but you need lots of luck with the converter.


I'll add another question, then: What's a good card (in terms of power) for Dolphin and Demul emulators if you're going to just use 480p with them? And for Type X and PC-based games? Would an HD 5750 suffice? Is it more capable than an HD 6570, video outputs apart?

buttersoft:
a PC is a digital, so any video card with an analogue video output, is using an internal DAC, perhaps made partly out of discrete components if you go back far enough :)

Nothing wrong with either of those cards, i don't think, though a 5000-series card might have two analogue outputs, as i believe you noted before. Personally i'd look at something like a 7870 or 7950 for a bit more grunt, maybe, or if you're after lower power usage or low profile, maybe an R7 250.

I have a question for you though - why use crt_emudriver for 480p? Can't you make your system output that already? Can you not just add custom modelines with a tool like ToastyX's CRU and tell the emulators not to scale? I'm almost completely clueless when it comes to 480p on crt_emudriver :/

Milsancho:

--- Quote from: buttersoft on August 09, 2023, 03:37:54 am ---a PC is a digital, so any video card with an analogue video output, is using an internal DAC, perhaps made partly out of discrete components if you go back far enough :)
--- End quote ---

The HD 6570 I already have has the VGA port like this, which has so many detractors here:



But maybe it's not related to the internal DAC?



--- Quote ---Nothing wrong with either of those cards, i don't think, though a 5000-series card might have two analogue outputs, as i believe you noted before. Personally i'd look at something like a 7870 or 7950 for a bit more grunt, maybe, or if you're after lower power usage or low profile, maybe an R7 250.
--- End quote ---

Dual analogue output is really a factor in my needs, though I don't really know if a more powerful card like those are better for Type X and PC-based arcade games or if it's no use because these never had powerful GPUs to begin with. Or what's the minimum a modern PC game like Shredder's Revenge generally demands... At least I do know that for Vulkan API compatibility I need HD 7750 or higher, but I don't really know if that API would do anything for me... Oh well.

Anyway, I'll ask here in case anybody has experience with this one:



in regards to dual analogue output.




--- Quote ---I have a question for you though - why use crt_emudriver for 480p? Can't you make your system output that already? Can you not just add custom modelines with a tool like ToastyX's CRU and tell the emulators not to scale? I'm almost completely clueless when it comes to 480p on crt_emudriver :/
--- End quote ---

Well, the idea is having a single computer for everything gaming (considering that I've no interest in modern 3D) with two monitors (+31khz and 15khz CRTs), so I thought that CRT Emudriver is the all-round solution. I've also read that, aside of other emulators, there're not few video modes Mame requires that will benefit from a PC CRT whilst not being standard PC resolutions, like 512p modes.




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