TTL RGB ==> PC

Chris M chrism3667 at yahoo.com
Fri Nov 16 14:08:38 CST 2007


--- Gordon JC Pearce <gordonjcp at gjcp.net> wrote:

> 
> On Thu, 2007-11-15 at 23:02 -0600, Jim Leonard
> wrote:
> > Alexis wrote:
> > > There's a line of chip from Analog Devices,
> AD273/AD274/AD275 and others,
> > > which will convert from RGB to NTSC/PAL. It
> gives composite and split video
> > > outputs. They're in the US$5 range. Perhaps this
> could be used with my
> > > previous circuit that converts TTL to analogue?
> > 
> > Possibly, but I'm still not sure that it would
> handle the intensity bit 
> > of CGA (RGBI).
> 
> We made a bodge cable for RGBI to analogue RGB. 
> It's just some
> resistors, really.

 Not likely the intensity bit was handled then. Yes
it's seemingly no problem to convert ttl levels to
ntsc or whatever.


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