New Scanline generator SLG3000 - available now!

[Hackcell]

you need a 31khz (480p) signal to use the SLG3000.

So, what can I use to have the scanlines effect on a 19 inch LCD monitor plugged to a MS pacman/galaga board?

[Fudoh]

you need a linedoubler first. Cheapest one would be a CGA2VGA board from eBay.

[philexile]

Hi bencao74, could you please get back to me when you have a moment? Thanks again!

[headlesshobbs]

How many of you tried pairing with a cheap HDMI to VGA converter now that there's plenty on the market?

[Fudoh]

How many of you tried pairing with a cheap HDMI to VGA converter now that there's plenty on the market?

You mean a HDMI to VGA converter in front of the SLG3000 ? Will work provided that the converter does output proper sync polarity. Most do, but I assume that some don't. What sources do you have in mind ?

[headlesshobbs]

Well I mainly wanted an analog output to the OSSC and I was just lucky enough to stumble upon a Belkin brand converter for $24 that I happened to pick up by chance. So far I've been exchanging it between that and direct hookup to my PS3.

Originally I was thinking of starting off a separate thread on digital to analog conversion because people still want to put their crt's to use, but I didn't think I had enough material worth discussion over. At least the PS3 has been outputting blu-ray's without any issues.

[Edagener]

Hello everyone!

Just heard about the SLG and got really excited about it but I have a question:

Would it work with this type of converter (the velleman VASMON3)?




Yes, I know it only takes composite video or S-video but since what I have is an old 48K rubber spectrum modded to s-video that's about the best I can get from the machine.

The Vasmon 3 outputs 640X480 on a VGA monitor and I have succesfully tested with the spectrum but I am very curious about the possibility of placing the SLG on ahead of it (and before the monitor) to get scanlines.

I read there could be a problem with sync polarity. Is the SLG current release able to deal with that possible issue?

[watchin]

Hello everyone!

I just bought a slg3000 to use with MAME but i'm not able to make it work and there are not scanlines at all. I set the computer reolution at 640x480 (and later 1024x768) and also in mame settings ... but nothing.

I start thinking that the problem is not the scanlines hardware but my mame settings (even when I tried all the possible combinations with different computers and screens).

Is there anyone using the slg3000 with MAME with happy results? Please, could you send me your mame.ini to check the differences with mine?

Thanks!

[watchin]

Hello everyone!

I just bought a slg3000 to use with MAME but i'm not able to make it work and there are not scanlines at all. I set the computer resolution at 640x480 (and later 1024x768) and also in mame settings ... but nothing. I also checked all switches combinations...

I start thinking that the problem is not the scanlines hardware but my mame settings (even when I tried all the possible combinations with different computers and screens).

Is there anyone using the slg3000 with MAME with happy results? Please, could you send me your mame.ini to check the differences with mine?

Thanks!

[Fudoh]

It's almost impossible to get NO scanlines at all when running through the SLG3000. The only possibility is your sync polarity. Are you using an external digital to VGA converter or are you getting native RGBHV from your video card? If so (the later) you can adjust the sync polarity with any of the advanced timing tools. Try that. You definitely want a 480p output, otherwise the scanlines will to too thin (on a 768p signal you get 384 scanlines instead of 240).

[Edagener]

Guys, I'm a bit at a loss here, could anyone advise me?

As far as I understand the Velleman VASMON3 is basically a "vga-box" accepting pal/ntsc CVBS or s-video signal, not a true line doubler.
The slg instructions state that :"The really most interesting practical operation should be the lower VGA resolution 640 x 480 at circa 60 Hz, using the double scanning mode of your graphic device."

Does that mean it will not work with the slg3000?

Has anyone tried the slg3000 with a vga box to see the result?

[Kez]

If the VGA signal is 480p, then it should add scanlines regardless of the source. What you're saying is that your VGA box is not an upscaler or linedoubler, so if you are putting in a 15khz signal (240p/480i) then it will not work with the SLG.

[Xyga]

This thing has a built-in automatic deinterlacer for composite and s-video inputs, outputing 'VGA'.

But there's apparently no control over the deinterlacer which I bet is the problem.

[Fudoh]

Where're all these interpretations coming from ? User watchin is not user Edagener.

The scan converter shown above (VASMON3) is your typical 15khz to 31+khz upscaler. It supports various output resolutions, but - of course - should be set to 480p for best results with a SLG unit.

The SLG3000 has dip switches to work around the sync polarity issues. Issues like that are rare anyway, so I wouldn't worry about that.

Has anyone tried the slg3000 with a vga box to see the result?

not with this particular one, but I used the SLG3000 on dozens of different upscalers and linedoublers.

[Edagener]

Well, thanks everybody for your opinions and insight on this!

I am a bit more confident now and I will probably buy one unit to try.

Will report back later the result.

Keeping my fingers crossed.

[Logan Jones]

Hey, has anyone tried playing Undertale with scanlines via an SLG3000? If so, show me the results. I'd love to see it!

[sharak]

Just got myself one of these; the manual pdfs are no longer properly linked; can someone explain how the dipswitches should work? Do I need to turn it off when changing them?

Lovely bit of kit, either way.

[Fudoh]

For 480p sources you can change between odd and even scanlines by setting for the dips 4/5 to ON/OFF or OFF/ON. OFF/OFF is for SVGA (800x600) due to the polarity change following the VESA timing rules.

If you set 1/2/3 to OFF then you get 100% darkened scanlines and the potentiometer gets disabled.

Do I need to turn it off when changing them?

no.

[sharak]

Thanks Fudoh.

I really like it. ArcadeForge website is getting on a bit!

[mitsuruga]

https://www.youtube.com/watch?v=4Aiv0le ... eamPandory

I got that thing and I thought I might use it with xbox 360 and CAVE games. Problem is the screen remains black, I tried different things, but nothing helps. Can anyone help?

[neorichieb1971]

You should have started a new thread as the SLG3000 is a VGA variant from 13 years ago.

A black screen might mean your TV isn't compliant with its output. I don't have a 360 but have you tried different resolution settings?

[titan91]

I have a Pentium MMX computer from 1995 with an onboard ATI Mach64 2D graphics accelerator chipset. I installed MS-DOS 6.22, Windows 3.1, and the ATI Windows drivers and utilities. Everything works fine in Windows, I get scanlines. But in MS-DOS, the scanlines appear but jitter and flicker. Clearly the flip-flop circuit isn't resetting on every frame, so the black lines get misaligned and create an interlaced effect.

I was stumped for days trying to figure out why this is. It happens with both the SLG3000 v2 and Mini SLG (not a clone, just a simpler circuit), as well as 720x400 70Hz and 640x480 60Hz text modes. Now I think I know why, when the Windows driver is loaded the card appears to output TTL level vsync and averages to 3.66v according to my multimeter. When in DOS, its output appears to switch to line level vsync and averages to 0.38v. I don't have an oscilloscope to verify the exact peak-to-peak signal levels, but TTL sync should be 5v.

Is there an interrupt or register that can be changed in MS-DOS mode to switch vsync to TTL level, maybe via a TSR? I realize this isn't a computer hardware thread, though. I assume at least a couple of volts is needed to trigger the reset pin on the flip-flop IC.

https://imgur.com/a/q3wIPRS

Edit:

I was finally able to figure this out. I used the LCD640 TSR from this thread to invert the vertical sync polarity.

https://www.vogons.org/viewtopic.php?t=86219

https://imgur.com/a/4IlCSdz