TTL RGB ==> PC

[Alexis]

>Eric J Korpela wrote:
>> I've had luck with converting the RGB to VGA and then converting the
>> VGA to NTSC using both this sort of device
>> (http://www.genao.com/converters.htm) and this
>> (http://www.converters.tv/products/cga_to_vga/425.html  (Warning,
>> expensive))
>>
>> Not cheap, but when it needs to be done, it needs to be done.
>>
>> converters.tv does have a CGA to NTSC converter that they are offering
>> for 110 AUD (~$100 US)
>> (http://www.converters.tv/signals/cga_to_ntsc.html)
>
>Unfortunately both the converters.tv units ignore the "intensity" pin of
>CGA, which means that only 8 of the 16 colors can be displayed from an
>IBM CGA card.  :-(  This is the bit (pun intended) missing from all
>converters I've come across, unfortunately.

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?

Alexis.