Software Support > GroovyMAME
Dual monitor setup questions.
Milsancho:
Hello and first off, thanks to Calamity and assistants for mantaining and creating these awesome tools.
I'm going to install GM on a setup with two monitors, a PC CRT monitor (2 VGA inputs) and a 15khz RGB TV. I have two Radeon cards and I'm reading that I should discard the HD4000 series even if it has two analog output, so my other option is an HD6500 something, which only have one VGA output, as the other is DVI-D, with an HDMI as well.
I'm just looking for recommendations for DACs, as I've read there're some turds there in the market. I don't know if I'd rather use a DVI-D to VGA instead an HDMI to VGA. The only thing if possible, I'd prefer something you can easily buy in Europe.
Cheers.
Milsancho:
So nobody is using a DAC with good results here? Maybe I should ask in the Monitor/Video Forum but since it's for a dual 31/15khz usage with Emu Driver, I thought more people here would be in the same situation. I'm sure I'll be facing more questions and didn't want to spam the forum with more than one thread either.
Thks.
SuperMagoAlex:
Hi,
I have a dual monitor setup 15khz (1 horizontal Sony Trinitron 15" and 1 vertical Commodore 1084S), and I'm using a DVI-D to VGA active adapter (Amazon).
It works well and I have pixel perfect on both monitors, but when I start a game I have to turn off the inactive monitor, otherwise a little wave effect appears on the monitor I'm playing on.
Milsancho:
Hi! Thanks for the input. So which brand and model is your converter? I'm sure if it works at 15khz it'll have no issues at 480p and beyond.
buttersoft:
Most older generic HDMI-to-VGA dongles used the AG6200 chipset. See pic below. This was designed for much higher bandwidths and, everything else being equal, works perfectly at 15kHz. However, lots of manufacturers have switched to cheaper chips now, especially in unbranded adapters. That's the problem linking to anything generic, as the seller won't know what's inside it and how it works. I bought more than a dozen looking for one to use for the MiSTer with direct video, and they all failed. I then grabbed about twenty older ones when my workplace had an E-waste clearout, and five of them worked with both separate sync and composite sync, and a further one worked with separate sync only.
In this style, do not buy anything new and generic that does not list the AG6200 chip. Do not buy Tendak. Brand-name ones like ugreen or Comsol or Belkin are a better bet, but still pretty random.
This one below lists the right chipset. I bought a different Vention one that also listed the AG6200 chip, and it works. There are no guarantees this one will, but it's worth a shot.
https://ventiontech.com/products/hdmi-to-vga-converter-black?variant=43107908518054
EDIT: Hmmm, it occurs to me to mention that higher dotclocks from super resolutions, or, say, from Radeon R7/R9 500 series cards with higher dotclock minimums, might mean a few more adapters work? Someone would need to test that to confirm.
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