C=128 80Col NTSC Color.
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From: Pheuque on 13 Mar 2007 19:29 http://www.twobits.com/RGB/rgbman.html This claims to allow CGA signal to be output to a NTSC or PAL compatible monitor. It designed for maintenance and modification on older video cabinet systems. The $200 price tag seems insane, but the actual circuit board doesn't seem to be too complicated. I would love to be able to use 80 Col color on my old Commodore 128s. My 1084 is gone, and finding a CGA monitor these days isn't so easy. I know others have looked at methods to get VGA out and failed. Perhaps we're working to hard. Maybe going to NTSC or PAL first will get us an acceptable signal. It's only 640 x 200 or or 640 x 400 interlaced. With that a simple switch box and an NTSC to VGA adapter would do the job. Does any one have more information on this board? Be nice to drive the cost down a bit.
From: christianlott1 on 13 Mar 2007 21:06 http://www.converters.tv/signals/cga_to_vga.html
From: Mangelore on 14 Mar 2007 04:53 Please note that these "CGA to VGA" or "CGA to PAL/NTSC" converters do not display the full 16 colours as they do not support the intesity output of the C128. They are RGB CGA devices, not RGBI. So, you'll only see the first 8 colours. Cheers Fotios bud wrote: > > Group: comp.sys.cbm Date: Tue, Mar 13, 2007, 6:06pm (CDT-2) From: > christianlott1(a)yahoo.com (christianlott1) > > script: > >> http://www.converters.tv/signals/cga_to_vga.html > > At $85 US, their RGB to composite converter is summat more reasonable. > > salaam, > dowcom > > To e-mail me, add the character zero to "dowcom". i.e.: > dowcom(zero)(at)webtv(dot)net. >
From: Brian Ketterling on 14 Mar 2007 06:24 "Mangelore" <fotios(a)commodore128.org> wrote in message news:7KOJh.10962$8U4.9123(a)news-server.bigpond.net.au > Please note that these "CGA to VGA" or "CGA to PAL/NTSC" converters do > not display the full 16 colours as they do not support the intesity > output of the C128. They are RGB CGA devices, not RGBI. So, you'll only > see the first 8 colours. I thought CGA was 16-color RGBI, with a two-level "I" signal. When I connect my old Zenith CGA monitor to my 128, I see 16 colors. Brian --
From: Mangelore on 14 Mar 2007 07:54
While I agree with you that CGA was RGBI, these converters to not process the "I" signal. The only have inputs for R,G,B,V,H,GND. Cheers Fotios Brian Ketterling wrote: > > I thought CGA was 16-color RGBI, with a two-level "I" signal. When I > connect my old Zenith CGA monitor to my 128, I see 16 colors. > > Brian |