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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Pertinax on February 07, 2006, 03:05:57 PM

Title: 15 pin VGA to 9 pin Phillips CM8833?
Post by: Pertinax on February 07, 2006, 03:05:57 PM

Does anyone know, or can work out, if its possible to take the 15 pin vga rgb signal from a sd/ff (using native Amiga screenmodes) and put it into a Philips CM8833 via its pin input connector?

The Philips can obviously display the native modes, and in theory, should be able to display the flickerfixed - not scan doubled - native modes? yes? no?

Help?



Jason

Title: Re: 15 pin VGA to 9 pin Phillips CM8833?
Post by: Piru on February 07, 2006, 04:03:09 PM

@Pertinax

Quote

The Philips can obviously display the native modes, and in theory, should be able to display the flickerfixed - not scan doubled - native modes?

No.

Title: Re: 15 pin VGA to 9 pin Phillips CM8833?
Post by: Pertinax on February 07, 2006, 04:29:14 PM

@Piru - Cheers ;)

So, the CM8833 can display Pal:Hi-Res Laced with flicker, but not if passed through a flickerfixer? Still no I going to guess..

Ho well...


Jason

Title: Re: 15 pin VGA to 9 pin Phillips CM8833?
Post by: Piru on February 07, 2006, 04:38:36 PM

@Pertinax

Quote

So, the CM8833 can display Pal:Hi-Res Laced with flicker, but not if passed through a flickerfixer?

Correct.

You need a VGA monitor for flickerfixer.

Title: Re: 15 pin VGA to 9 pin Phillips CM8833?
Post by: Pertinax on February 07, 2006, 05:05:56 PM

Sorry Piru - not trying to wind you up, or wear you down but... why?

What does the flickerfixer do to the signal?
Just want a reason really, I thought only the scandoubler did things to the signal, throwing it out from the range displayable on the CM8833...

As you can tell, I'm not really read up on this... :)


Jason

Title: Re: 15 pin VGA to 9 pin Phillips CM8833?
Post by: Piru on February 07, 2006, 05:11:50 PM

@Pertinax

Flickerfixer changes the signal aswell. Whether the thing works with regular SVGA monitor or if you need some 15kHz capable one depends on the flickerfixer HW.

Regardless, the end result is that flickerfixer output cannot be displayed no regular video monitor such as CM8833.

Title: Re: 15 pin VGA to 9 pin Phillips CM8833?
Post by: amigagr on February 07, 2006, 05:12:06 PM

you can't imagine what things it's doing to the signal :-)
the scandoubler doubles(!) the horizondial lines of the tv signal from  15.625 to 31.250.

Title: Re: 15 pin VGA to 9 pin Phillips CM8833?
Post by: Pertinax on February 07, 2006, 07:03:39 PM

Thanks guys ;)