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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Tue Jan 22, 2008 7:48 am Post subject: What's the difference between TTL and RGB? |
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I saw an older monitor for sale that can accept TTL and RGBHV signals as well as analog through a 15 pin joystick/midi style port.
I was just wondering what use the TTL input would be and what's the difference between that and RGB?
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ecrabb
Forum Moderator
Joined: 13 Mar 2006
Posts: 15909
Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Tue Jan 22, 2008 8:43 am Post subject: |
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TTL - Transistor-transistor logic... It's a really old digital video signal used on computers. I think it was used on CGA cards and they were 320x200 or something. 16 colors or something. First color graphics computer output. You definitely couldn't use it for anything now (well, unless you had an old 8088 machine with a CGA card in it, I guess!)
That must be a mid-80's piece of equipment you were looking at. My Dad had an Infinity 'RSTV' (for Reference Standard TV)  front projector with a TTL input on it. TTL, but no s-video. I can't remember exactly, but I think that was 83/84 vintage.
SC
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AnalogRocks
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Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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Axatax
Joined: 01 Nov 2006
Posts: 403
TV/Projector: Sony VPH-G70Q (aka Barco Cine8 Onyx)
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| Posted: Tue Jan 22, 2008 6:50 pm Post subject: |
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Yep. MDA, CGA, and EGA are all TTL-level signals.
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Tue Jan 22, 2008 7:16 pm Post subject: |
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| Axatax wrote: | | Yep. MDA, CGA, and EGA are all TTL-level signals. |
Would you belive I still own a CGA card...somewhere. lol
I was thinking of running this with a steering wheel in front of it. According to the spec's it'll sync to 15-38 kHz I'm wondering if I can get 1080i out of it? I know it'll do 1024 x 768 at least.
If anyone knows where I can find the 27" version I'd be interested. That baby will do 1600x1200 at 75Hz.
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Heywood Jablome
Joined: 12 Mar 2006
Posts: 1548
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| Posted: Wed Jan 23, 2008 12:54 pm Post subject: Re: What's the difference between TTL and RGB? |
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| AnalogRocks wrote: |
I was just wondering what use the TTL input would be and what's the difference between that and RGB? |
About 4.25 volts!
I have a large presentation monitor... I need to verify the model number but it may be the 29" version of this set. It syncs to 1080i just fine, but the pixel size makes it pretty much unusable (think like .75mm dot pitch.)
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"Those countries which lag behind in industry, in the application of mechanics and technical chemistry, in the careful selection and utilization of natural products, where the respect for such activities does not permeate all classes of society, will unfailingly decline in prosperity. They will sink faster when neighbor states, with an energetic exchange between science and industry, go forward with renewed vitality."
-- Baron Alexander von Humboldt: 1769-1859
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