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SubjectAmiga on VGA monitor? Reply to this message
Posted byTerry Bogard
Posted on03/04/08 06:50 PM



So, I got this Amiga 500+ with a bunch of working (don't ask me how) games, and I have like 4 or 5 old, unused CRT monitors from even older PCs. I would love to pump the Amiga video signal on one of those, so I would like to know if anybody of you has tried this already, and their mileage.

Here's some research I did:

1) I looked for the pinouts of the Amiga output and the VGA input, and here they are:

VGA: http://pinouts.ru/Video/VGA15_pinout.shtml
Amiga: http://pinouts.ru/Video/AmigaVideo_pinout.shtml

Gotta love russian sites. It looks like all the needed signals are there, assuming they are RGB and the respective GNDs, HSYNC and VSYNC.

2) Looking for a confirmation to my theories, I found this: http://www.programmersheaven.com/download/865/download.aspx

So it looks like some effort will be needed to invert the sync signals. Ok, I can do that stuff.

3) However, other sites see the problem differently: http://www.amigau.com/aig/vga.html

According to this page, it's not just a matter of signal polarity, but of scan rate, too. I may have one or two multisync CRTs that maybe will show "unsupported rate" instead of hissing and smoking if anything goes wrong.

Any experience/thought/knowledge you'd like to share? Everything is welcome. Even Goatse, if it carries useful info.




SubjectRe: Amiga on VGA monitor? new Reply to this message
Posted bywildcat
Posted on03/04/08 08:28 PM



> 3) However, other sites see the problem differently:
> http://www.amigau.com/aig/vga.html
>
> According to this page, it's not just a matter of signal polarity, but of scan
> rate, too. I may have one or two multisync CRTs that maybe will show
> "unsupported rate" instead of hissing and smoking if anything goes wrong.

That's about the size of it. I don't know of any VGA monitors that go that slow; most go at twice that. Apparently they exist, though.

Game systems that do RGB (Genesis, SNES, Saturn) run into that problem, too.




SubjectLink inside... new Reply to this message
Posted bySilentAce
Posted on03/05/08 09:57 AM



not sure if this will work for yah or not

http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=183


> So, I got this Amiga 500+ with a bunch of working (don't ask me how) games, and
> I have like 4 or 5 old, unused CRT monitors from even older PCs. I would love to
> pump the Amiga video signal on one of those, so I would like to know if anybody
> of you has tried this already, and their mileage.
>
> Here's some research I did:
>
> 1) I looked for the pinouts of the Amiga output and the VGA input, and here they
> are:
>
> VGA: http://pinouts.ru/Video/VGA15_pinout.shtml
> Amiga: http://pinouts.ru/Video/AmigaVideo_pinout.shtml
>
> Gotta love russian sites. It looks like all the needed signals are there,
> assuming they are RGB and the respective GNDs, HSYNC and VSYNC.
>
> 2) Looking for a confirmation to my theories, I found this:
> http://www.programmersheaven.com/download/865/download.aspx
>
> So it looks like some effort will be needed to invert the sync signals. Ok, I
> can do that stuff.
>
> 3) However, other sites see the problem differently:
> http://www.amigau.com/aig/vga.html
>
> According to this page, it's not just a matter of signal polarity, but of scan
> rate, too. I may have one or two multisync CRTs that maybe will show
> "unsupported rate" instead of hissing and smoking if anything goes wrong.
>
> Any experience/thought/knowledge you'd like to share? Everything is welcome.
> Even Goatse, if it carries useful info.
>
>



Subjectbut then new Reply to this message
Posted byTerry Bogard
Posted on03/06/08 06:39 PM



> > 3) However, other sites see the problem differently:
> > http://www.amigau.com/aig/vga.html
> >
> > According to this page, it's not just a matter of signal polarity, but of scan
> > rate, too. I may have one or two multisync CRTs that maybe will show
> > "unsupported rate" instead of hissing and smoking if anything goes wrong.
>
> That's about the size of it. I don't know of any VGA monitors that go that
> slow; most go at twice that. Apparently they exist, though.

What's that interface I found for, then? One of these rare monitors?

I wish there was some cheap trick to double the HSYNC frequency and still have a correct image displayed, but I'm no electronics whiz. I even suck at soldering.

> Game systems that do RGB (Genesis, SNES, Saturn) run into that problem, too.

And yet, a friend of mine, some years ago, showed me his box that let him play his Megadrive (Genesis for Europe) to a PC monitor. The image was not as crips as an emulator, but still decent. I'm not sure, but I guess it converted the SCART signal to some fixed res (640x480?), not really desirable with an Amiga...





Subjectthanks, seen that new Reply to this message
Posted byTerry Bogard
Posted on03/06/08 06:41 PM



Since it seems there is no other chance, I may waste some money trying this.

I hope it ends better than the XBox->component cable I bought some time ago: waving patterns over the image, worse than s-video :(

Thanks anyway.

> not sure if this will work for yah or not
>
> http://amigakit.leamancomputing.com/catalog/product_info.php?products_id=183
>
>
> > So, I got this Amiga 500+ with a bunch of working (don't ask me how) games,
> and
> > I have like 4 or 5 old, unused CRT monitors from even older PCs. I would love
> to
> > pump the Amiga video signal on one of those, so I would like to know if
> anybody
> > of you has tried this already, and their mileage.
> >
> > Here's some research I did:
> >
> > 1) I looked for the pinouts of the Amiga output and the VGA input, and here
> they
> > are:
> >
> > VGA: http://pinouts.ru/Video/VGA15_pinout.shtml
> > Amiga: http://pinouts.ru/Video/AmigaVideo_pinout.shtml
> >
> > Gotta love russian sites. It looks like all the needed signals are there,
> > assuming they are RGB and the respective GNDs, HSYNC and VSYNC.
> >
> > 2) Looking for a confirmation to my theories, I found this:
> > http://www.programmersheaven.com/download/865/download.aspx
> >
> > So it looks like some effort will be needed to invert the sync signals. Ok, I
> > can do that stuff.
> >
> > 3) However, other sites see the problem differently:
> > http://www.amigau.com/aig/vga.html
> >
> > According to this page, it's not just a matter of signal polarity, but of scan
> > rate, too. I may have one or two multisync CRTs that maybe will show
> > "unsupported rate" instead of hissing and smoking if anything goes wrong.
> >
> > Any experience/thought/knowledge you'd like to share? Everything is welcome.
> > Even Goatse, if it carries useful info.
> >
> >
>





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