RGB -> VGA resolution question.

Thorham · 23 November 2010, 10:07

Hi,

I've recently ordered a VGA adapter from Amigakit. What I want to know is, what resolutions can I expect to see working? It would be great to have 800x600 or something close to that. This is exclusively for enhancing Workbench use, because I'm getting tired of the crappy composite video output.

This will be used with my CRT SVGA monitor, and I'm aware that this monitor won't sync down to 15 Khz (have a video box for that).

Any pointers are appreciated

DDNI · 23 November 2010, 10:51

hmm not clear on exactly what you have purchased, is it a 23pin RGB to 15pin VGA adapter? Amigakit link

If so these cables only allow you to plug a VGA cable into an Amiga. They perform no scan doubling. This means that if your Monitor does not handle 15khz (PAL/NTSC) signals, then with this adapter, it still wont.

BUT for WB use You can use screen modes like
DBLPal
DBLNTSC
Euro 36Hz and 72Hz
Multiscan/Productivity
Super72
VGA Only

Available resolutions described here

Please note that this is just an adapter, the RGB signal is passed unaltered to the monitor. So if you are using a VGA/Multiscan monitor (which usually starts at 30 kHz) with it, you have to use an appropiate screen mode, i.e. DblPAL/DblNTSC or Multiscan Productivity. A normal VGA/Multiscan monitor is not able to display PAL or NTSC screen modes. From Vesalia.

Thorham · 23 November 2010, 11:51

Thank you, that list of resolutions is exactly what I'm looking for

I'm aware that this adapter doesn't do scan doubling and I've got a video box for that (composite/svideo -> VGA)

Are there any ways to tweak those resolutions with some software?

deicidal · 23 November 2010, 12:02

Which box do you have?

Thorham · 23 November 2010, 14:01

It's an AVerTv Box7. Has compoiste video in, s-video in, SVGA through and a built in TV tuner. I'm currently using it mostly for connecting my Amiga to my monitor through composite video (I don't watch much TV). Good enough for games and demos, but certainly very sucky for Workbench applications (although doable).

Fabie · 23 November 2010, 17:56

Quote:

Originally Posted by Thorham

It's an AVerTv Box7. Has compoiste video in, s-video in, SVGA through and a built in TV tuner. I'm currently using it mostly for connecting my Amiga to my monitor through composite video (I don't watch much TV). Good enough for games and demos, but certainly very sucky for Workbench applications (although doable).

maybe you can see pal/ntsc 15hz modes using the vga adapter because in fact the avertv box is a scandoubler
I read that on some tvbox the vga-in is a passtrhough and in others is not a passtrough...so 15hz modes will work
post later if works

Thorham · 24 November 2010, 20:27

Nope, sadly the box doesn't scan double

Anyway, is there a way to make custom screen modes? I'd like to use the resolution I'm using now, but the standard monitor drivers don't offer the option. Seems it should work, because I'm just using a 15.something Khz mode (high res lace+overscan).

23 November 2010, 10:07	#1
Thorham Computer Nerd Join Date: Sep 2007 Location: Rotterdam/Netherlands Age: 47 Posts: 3,751	RGB -> VGA resolution question. Hi, I've recently ordered a VGA adapter from Amigakit. What I want to know is, what resolutions can I expect to see working? It would be great to have 800x600 or something close to that. This is exclusively for enhancing Workbench use, because I'm getting tired of the crappy composite video output. This will be used with my CRT SVGA monitor, and I'm aware that this monitor won't sync down to 15 Khz (have a video box for that). Any pointers are appreciated Last edited by Thorham; 23 November 2010 at 11:44.

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23 November 2010, 10:51	#2
DDNI Targ Explorer Join Date: Mar 2006 Location: Northern Ireland Posts: 5,431	hmm not clear on exactly what you have purchased, is it a 23pin RGB to 15pin VGA adapter? Amigakit link If so these cables only allow you to plug a VGA cable into an Amiga. They perform no scan doubling. This means that if your Monitor does not handle 15khz (PAL/NTSC) signals, then with this adapter, it still wont. BUT for WB use You can use screen modes like DBLPal DBLNTSC Euro 36Hz and 72Hz Multiscan/Productivity Super72 VGA Only Available resolutions described here Please note that this is just an adapter, the RGB signal is passed unaltered to the monitor. So if you are using a VGA/Multiscan monitor (which usually starts at 30 kHz) with it, you have to use an appropiate screen mode, i.e. DblPAL/DblNTSC or Multiscan Productivity. A normal VGA/Multiscan monitor is not able to display PAL or NTSC screen modes. From Vesalia.

23 November 2010, 11:51	#3
Thorham Computer Nerd Join Date: Sep 2007 Location: Rotterdam/Netherlands Age: 47 Posts: 3,751	Thank you, that list of resolutions is exactly what I'm looking for I'm aware that this adapter doesn't do scan doubling and I've got a video box for that (composite/svideo -> VGA) Are there any ways to tweak those resolutions with some software?

23 November 2010, 12:02	#4
deicidal Registered Insane Join Date: Feb 2010 Location: Ununited Kingdom Posts: 792	Which box do you have?

23 November 2010, 14:01	#5
Thorham Computer Nerd Join Date: Sep 2007 Location: Rotterdam/Netherlands Age: 47 Posts: 3,751	It's an AVerTv Box7. Has compoiste video in, s-video in, SVGA through and a built in TV tuner. I'm currently using it mostly for connecting my Amiga to my monitor through composite video (I don't watch much TV). Good enough for games and demos, but certainly very sucky for Workbench applications (although doable).

24 November 2010, 20:27	#7
Thorham Computer Nerd Join Date: Sep 2007 Location: Rotterdam/Netherlands Age: 47 Posts: 3,751	Nope, sadly the box doesn't scan double Anyway, is there a way to make custom screen modes? I'd like to use the resolution I'm using now, but the standard monitor drivers don't offer the option. Seems it should work, because I'm just using a 15.something Khz mode (high res lace+overscan).

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