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by imaginaryeast
Fri Dec 07, 2018 2:56 pm
Forum: Advanced users
Topic: CGA Output from GERT666 (or other GPIO connection)
Replies: 6
Views: 1822

Re: CGA Output from GERT666 (or other GPIO connection)

Ok. I'm bumping this because I ran into a roadblock.
None of the VGA to CGA converters I can find out there actually produce RGBI.

Does anyone know of a way to get 4 bit RGBI out of the pi's GPIO header?

If that's impossible, a true VGA to CGA (RGBI) converter?
by imaginaryeast
Mon Dec 03, 2018 6:32 pm
Forum: Advanced users
Topic: CGA Output from GERT666 (or other GPIO connection)
Replies: 6
Views: 1822

Re: CGA Output from GERT666 (or other GPIO connection)

i would be a little suspicious if the output would support a TTL CGA input, but who knows? The problem is those amazon converts don't really offer much in the way of support the 5153 does not have a composite input either, so far as i can tell? which would mean you can't take advantage of programs t...
by imaginaryeast
Tue Nov 27, 2018 3:31 pm
Forum: Advanced users
Topic: CGA Output from GERT666 (or other GPIO connection)
Replies: 6
Views: 1822

Re: CGA Output from GERT666 (or other GPIO connection)

Anything is possible, A level shifter is needed to take the 3.3v logic of the pi to 5v then you have the 4 signals for colour Red Green Blue Intensity, then the sync signals Vsync, Hsync You'd need to set the resolution to a maximum of 640x200 You most likely won't get true CGA out but 8 or 16(if y...
by imaginaryeast
Tue Nov 13, 2018 2:47 pm
Forum: Advanced users
Topic: CGA Output from GERT666 (or other GPIO connection)
Replies: 6
Views: 1822

CGA Output from GERT666 (or other GPIO connection)

I have a monitor which accepts 4-bit TTL CGA Only. Does anyone know if there is a way to directly output 4-bit TTL from the Raspberry Pi? I know that there exists VGA-CGA converters, but it would be quite difficult to implement in the intended setup. I am looking for a way to output CGA directly fro...

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