Re: C16/Plus4

From: Gerrit Heitsch <>
Date: Mon, 31 Oct 2011 12:02:18 +0100
Message-ID: <>
On 10/31/2011 11:40 AM, Anders Carlsson wrote:

> Perhaps if the TED chip had built-in RGB output, it would have been more
> popular in France etc, but then again on a cheap low-end European
> market, not too many users in 1983/84 would have a TV with RGB SCART
> input anyway.. at least not outside France.

Most TVs back then had at most a CVBS input. S-Video came later. So a 
home computer with RGB out would have been overkill.

I do consider it quite an achivement that MOS had video controllers that 
produced S-Video on die and needed only a small driver circuit per 
signal to be ready to use. What other low cost video controllers back 
then had that?

> However it is true that e.g.
> Acorn Electron has a TTL RGB output just like its big brother, the BBC
> Micro.

RGB needs more pins and if your output is 40 chars per line, S-Video is 
plenty good. Unless of course, you have a crappy modulator in the signal 
path that does horrible things to your signal.

 From a C64 forum I got a small circuit (2 transistors plus a few 
passive components) that one can use instead of the modulator. You get 
S-Video only at the output then (no CVBS anymore), but the picture is 
really good. I haven't tried it on a C16 yet, but I see no reason why it 
shouldn't work there too.


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Received on 2011-10-31 12:00:10

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