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Re: The Quest for Pixel Perfect DOS Emulation

Posted on 2021-02-02, 22:46

I am using Sunix DPU3000 with it's own DAC to connect to modern GPU DisplayPort output: http://www.sunix.com/product/DPU3000.html It's DAC can go up to 550MHz. Most GPUs have max 400MHz built-in DAC. So I can run resolutions like 2880x2160@60Hz on a CRT. There is no additional lag. All you need to …

Re: If we were to accept 15 years ago as retro....

Posted on 2021-02-01, 23:18

I got into computing a lot later than most of you. My parents were poor growing up. I didn't get my first PC until I was twelve, that was 2005, and it was the era of the ultra cheap PC. Pentium IV, 64mb of RAM, windows XP, integrated graphics. It was terrible, and I used it for almost five years. My …

Re: The Quest for Pixel Perfect DOS Emulation

Posted on 2021-02-01, 18:31

Very interesting. I don't have a graphics card with VGA or DVI-A(nalogue) in my modern PC and if I find some space for my CRT, I would connect it to my retro rig :) I have been tinkering with a VGA-HDMI adapter https://images-na.ssl-images-amazon.com/images/I/61ft1dP1VQL._AC_SY450_.jpg but a lot of …

The Quest for Pixel Perfect DOS Emulation

Posted on 2021-02-01, 07:24

I hope I am not overstaying my welcome by creating two threads on the same topic! A while ago I started asking questions about how to run DOSBox at native resolutions on a CRT monitored. I ended up going down quite the rabbit hole trying to figure it out, and so I wanted to post this to help …

Re: What should I know about building my first ever Windows 98 Retro Gaming PC?

Posted on 2021-01-31, 08:23

Do people use SSD's on Win98 now? I thought the better solution was a CF card with IDE adapter. Or at least a mechanical with SATA/IDE adapter. Yes, even Windows 98 benefits from the responsiveness of an SSD. CF cards work fine for most things, but larger ones are super hard to find and an SSD will …

Re: Dosbox without scaling?

Posted on 2021-01-30, 00:00

DosFreak wrote on 2021-01-29, 23:16: Did you try enabling vsync in Quake itself? Re: Is original DOS quake speed-sensitive? Thanks, that is the issue! Setting _VID_OVERRIDE_WAIT "1" and adding VID_WAIT "1" does fix it, at least for all of the lower resolutions. 640x480 and 640x400 are still to fast …

Re: Dosbox without scaling?

Posted on 2021-01-29, 22:58

I spent some more time with quake and noticed some things. For one, quake never seems to run at 72hz on any resolution, at least not on my monitor. I don't know why 72hz is the documented max framerate for quake online, maybe that is true for glquake or something. Depending on the selected …

Re: Dosbox without scaling?

Posted on 2021-01-29, 05:15

It looks like SDL2 has the ability to set the refresh rate but not SDL 1.2. For SDL 1.2 you'd have to modify the SDL code to do it. Would CRU be able to change those settings via CLI? Unfortunately no, you have to restart the display driver every time you make a change. Is there a version of dosbox …

Re: Dosbox without scaling?

Posted on 2021-01-29, 01:48

I know you kind of did it above but if you could go back over what you had to do and re-check again and summarize what you had to do with dosbox itself and on the host then that would be helpful. I noticed a mistake with vgaonly being in the language part of the attached config? It's possible we …

Re: Dosbox without scaling?

Posted on 2021-01-28, 23:22

I know you kind of did it above but if you could go back over what you had to do and re-check again and summarize what you had to do with dosbox itself and on the host then that would be helpful. I noticed a mistake with vgaonly being in the language part of the attached config? It's possible we …

Re: Dosbox without scaling?

Posted on 2021-01-28, 20:42

Afaik 720x400 on VGA is just like 640x480, but with stretching to fit the same screen area. At least, that's what UniPCemu does in it's standard 800x600 raster(in the VGA 4:3 mode). That's exactly what the real VGA is supposed to do as well? Although VGA-compatible cards should produce the same …

Re: Dosbox without scaling?

Posted on 2021-01-28, 17:53

Success! I had assumed that Dosbox, when set to a 2x scale, would scale everything by 2x. That isn't true. It looks like it only scales low resolution outputs like 320x200, while keeping high res outputs like text modes or high res graphics 1-1! What's more, although DOS VGA standards includes a …

Re: Dosbox without scaling?

Posted on 2021-01-27, 21:16

I found what appears to be the exact display timings for some common VGA modes. http://tinyvga.com/vga-timing http://tinyvga.com/vga-timing/640x400@70Hz From what I have been reading, CGA and EGA compatibility modes in VGA cards would use this display timing as well. The problem I am having with …

Re: Dosbox without scaling?

Posted on 2021-01-27, 18:12

With the 200 lines video modes you have to double the scan lines when you setup that video mode. Otherwise you get a 15 kHz horizontal frequency and that is too low. The original VGA always scan doubled those low resolutions to keep the horizontal refresh high enough (and it looks sharper). So a …

Re: Dosbox without scaling?

Posted on 2021-01-27, 05:27

Ok, I have had a bit of success. If I up the refresh rate for 320x200 to 140hz, double 70hz, then dosbox will use it and it works fine. I think this is because 320x200@140hz has a horizontal sync rate of about 30khz instead of 15khz. Anything in the PC range pixel clock wise seems to work a lot …

Re: Dosbox without scaling?

Posted on 2021-01-27, 04:46

I had more success creating custom resolutions in windows 10 as well as fully disabling all forms of software scaling. I am not sure of dosbox is capable of running in 320x200 or a similar resolution or not, but I think it will try to find the closes resolution available to your graphics card. …

Re: Dosbox without scaling?

Posted on 2021-01-27, 01:50

I am using analog VGA right from the DVI-I, so I don't think it is a DAC issue. Or if it is, there isn't much of a way for me to get around it. I am using driver 355.98. I can't set a custom resolution of 320x because nvidia doesn't think my display supports it. It definitely does, I have used it …

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