Has anyone successfully connected to an RGB monitor

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NML32
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Has anyone successfully connected to an RGB monitor

Post by NML32 » Fri Mar 02, 2018 5:19 pm

The screen keeps rolling on my Sony RGB monitor.
https://youtu.be/1oU2ur9FGxY

Using a VGA to BNC cable.
Monitor: SONY PVM20M2MDU
Using the VGA Config file, changed scan doubler setting to scandoubler=0

Firmware v.1.0.4f
Core v.1.10.026
Next OS: 1.97c

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Timbucus
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Re: Has anyone successfully connected to an RGB monitor

Post by Timbucus » Fri Mar 02, 2018 7:24 pm

That looks like a vertical sync problem - this can be adjusted using the timing parameter from 0-7 in the config.ini (7 is actually the lowest but 0-6 raise it in some jumps) and obviously the 50/60 parameter between 50 and 60Hz so you can get anything from 49-67 - there could also be a POT on the monitor if it gets close to lock it in. Try a few combinations.
I'm Infinite Imaginations when not in work... PAWS for thought.

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NML32
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Re: Has anyone successfully connected to an RGB monitor

Post by NML32 » Fri Mar 02, 2018 8:00 pm

Thanks, but adjusting the timings didn't help. I don't want to modify any POTs since my MiST, and MiSTer FPGAs work fine on this RGB monitor. I'll just wait and see if it gets better with future updates.
I'm curious if anyone has had any success connecting their Next to an RGB monitor.

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Timbucus
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Re: Has anyone successfully connected to an RGB monitor

Post by Timbucus » Fri Mar 02, 2018 8:11 pm

Yes Victor uses one - perhaps others will answer as well. Mine sadly is defective so I cannot test.
I'm Infinite Imaginations when not in work... PAWS for thought.

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Timbucus
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Re: Has anyone successfully connected to an RGB monitor

Post by Timbucus » Fri Mar 02, 2018 8:13 pm

In your video you only show using F3 to turn on and off 50/60 - did you try all boot options from 0-7 the second parameter after the machine timing 2 (it is set to 3 in this example)

menu=ZX Spectrum Next VGA(3),2,3,enNextOS.rom,nextmmc.rom
I'm Infinite Imaginations when not in work... PAWS for thought.

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NML32
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Re: Has anyone successfully connected to an RGB monitor

Post by NML32 » Fri Mar 02, 2018 8:39 pm

Timbucus wrote:
Fri Mar 02, 2018 8:13 pm
In your video you only show using F3 to turn on and off 50/60 - did you try all boot options from 0-7 the second parameter after the machine timing 2 (it is set to 3 in this example)

menu=ZX Spectrum Next VGA(3),2,3,enNextOS.rom,nextmmc.rom
I didn't in the video but after making the video I tried different settings and it didn't help.

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Timbucus
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Re: Has anyone successfully connected to an RGB monitor

Post by Timbucus » Fri Mar 02, 2018 9:25 pm

OK - I will try and bring it to the team's attention...
I'm Infinite Imaginations when not in work... PAWS for thought.

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NML32
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Re: Has anyone successfully connected to an RGB monitor

Post by NML32 » Fri Mar 02, 2018 10:33 pm

Timbucus wrote:
Fri Mar 02, 2018 9:25 pm
OK - I will try and bring it to the team's attention...
After talking to you and Victor I did some more research on this problem and found a gaming forum with a discussion going on with a very similar issue I'm having with a solution. Luckily it worked for me too. :D

I have two VGA to BNC cables connected to my monitor. One has red, green, blue, black, and white the other only has red, green, blue, and black. I connected the cables per the gaming forum suggestion and I got a stable picture. I only get a stable picture using the cable with the 5 BNC connectors.
Forum with the fix
sony.jpg
sony.jpg (115.24 KiB) Viewed 1237 times
The "white" lead provides connections for horizontal sync and ground.

The "black" lead provides connections for vertical sync and ground.

Without the vertical sync, the picture rolls... This explains the described rolling of the picture without the black lead (vertical sync) connected - not because it provides ground!

Thank you and Victor for helping me out.

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NML32
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Re: Has anyone successfully connected to an RGB monitor

Post by NML32 » Fri Mar 02, 2018 11:13 pm

Short video of my ZX Spectrum Next working on my RGB monitor. Looks way better in person.
https://youtu.be/FYOxPKNKn_I

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