what happened CBM=VGA
in [Commodore]
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From: a7yvm109gf5d1 on 3 Apr 2006 10:55 " Well, some of those boxes designed to hook a VGA monitor up to your Playstation use the playstation's RGB output." Excellent. Specify, specify, don't design. Can you be bothered to get data on this ps to VGA adapter? Then we can see what needs to be done to convert the 15KHz RGBI to whatever the ps2VGA box wants?
From: a7yvm109gf5d1 on 3 Apr 2006 14:16 The 128's output is RGBI, we're not out of the woods yet!
From: Vanessa Dannenberg on 3 Apr 2006 17:09 For those wondering about the C= VGA... There is a small circuit I devised, which can be found on my website, which I think will work for the C128 RGBI -> VGA part. It ain't fancy, and probably won't look too hot in interlaced mode, but it's a start: http://starbase.globalpc.net/~vanessa/projects.html It doesn't handle the VIC/composite side of things, just VDC/RGBI. The circuit is untested, I'm hoping someone can take it and make it work (if the design doesn't work already), and just let us all know here on c.s.c. -- Sometimes paranoia can be helpful. Usually, it isn't, and when you learn that, life improves. Vanessa Dannenberg <vaneDsEsLaEdTaEnneTnHbIeSrg(a)gmail.com Remove the obvious from my email address to reply.
From: Vanessa Dannenberg on 3 Apr 2006 17:38 For those wondering about the C= VGA Since it's taking so long for this thing to come out, I decided to make my own thing instead.. Found on my website (below) is a small circuit I devised, which I think will work for the C128 RGBI -> VGA part. It ain't fancy, and probably won't look too hot in interlaced mode, but it's a start: http://starbase.globalpc.net/~vanessa/projects.html It doesn't handle the VIC/composite side of things, just VDC/RGBI. The circuit is untested, I'm hoping someone can take it and make it work (if the design doesn't work already), and just let us all know here on c.s.c. (original post "superceded" to correct an error) -- Sometimes paranoia can be helpful. Usually, it isn't, and when you learn that, life improves. Vanessa Dannenberg <vaneDsEsLaEdTaEnneTnHbIeSrg(a)gmail.com Remove the obvious from my email address to reply.
From: a7yvm109gf5d1 on 3 Apr 2006 22:07
"I'm with you whoever you are. When or if it ever appears I'll grab one." Depends if you want an internal or external solution. The AL250 looks good to go for an internal hack on a 128. A bit of hardware on the input side and LUT values for the mapping of RGBI to 565. If you want an external box, I'd need to specify a scan-doubling chip with an internal PLL. The AL250 I referred to as an example doesn't have a PLL. Analog Devices, SI or Philips might have some. They usually make the chips for the "HD" upsampling DVD players, for people who think they have HD when in reality all they have is de-interlaced NTSC with some DSP trickery. (Hint: Most displays touted as HD aren't, and there are no HD-DVDs out yet anyways) One problem with using newer chips is that they tend to cater to high volume applications ("go away, hobbyists") and come in crazy packages. Look at the Philips SAA7118, it's in a BGA 156 package. And you need careful power supply analysis if you want something like that to work correctly on a cheap 2 layer PCB. Second problem is that we are into several generations of these chips by now. They have many powerful features for video compensation and using any standard input type. I'd spend most of my time reading the data sheet to figure which features to turn OFF for the simple job of upscanning the 128's RGBI... That's no fun, it's a job for a summer student. I think I know why the C=VGA has taken three years so far. :) |