Re: VERY strange ebay bidding

["Christopher G. Mason" <cgm1@my-deja.com>]

Polymorph wrote:
> There are many out there wanting a solution to replace their old IIgs 
> RGB monitors, so if you've found a workable solution and can produce the 
> proof, please do! I know myself and many others would be incredibly 
> interested if an off-the-shelf solution exists that produces *good* 
> results - i.e. somewhere in between "OK" and "perfect"; ideally more 
> towards the "perfect" end.  :-)

I have reproduced what Jim saw with the XRGB2+. The problem with LCD 
displays and the device is well documented. Using a CRT however produced 
stable video with the IIgs. The problem likely has to do with the 
scaling in LCD/Plasma displays, there are some (very) expensive video 
processors that can do the job and output DVI/HDMI. A bit overkill for a 
IIgs, but you get a pretty picture.

One solution that minimally processes the video is a RGB to component 
(YCbCr) transcoder. A schematic for one is here: 
http://elm-chan.org/works/yuv2rgb/rgb2yuv.png

This device will allow one to hook a IIgs up to any TV with component 
video jacks. The TV handles the video synchronization vs. an upscaler's 
video processor in this case. Just note that the diagram accepts 
composite video in for a sync source, it strips out the video using a 
LM1881. You can input a raw composite sync signal into the LM1881 
without any ill effects. Examples of assembled products can be found at 
the below links:

http://www.crescendo-systems.com/transcoder.html
http://www.jrok.com/hardware/RGBv4/index.html