In the arcade machines that I collect, we use CGA type monitors from Wells-Gardner, Electrohone...etc. These monitors are apparently just the basic circuits from a TV without the tuner. They use standard R-G-B- sync as inputs. In fact there was one monitor I had that had an entire section of parts missing that was the tuner circuit and stuff.
So my question is.. on a Color TV is there a spot where I can tap in and input R-G-B-Sync to convert a Television into a CGA monitor?
The quick answer is: probably for the RGB, at the output of the video chip. And, possibly for the sync.
However, there could be other issues like if the tuner doesn't see any signal, it may simply diable the picture (and sound) elsewhere, so there could be additional annoying details to address.
If you have a particular TV in mind, go find the Sams' Photofact for the set and see if these signals.
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Hi Sam...
I respectfully submit that the result could be a serious safety issue...
I believe they do (or did) require opto isolators.
Take care.
Ken
A CGA monitor is TTL levels on the video and sync, while the TV is 1V P-P NTSC or other video system so you have to convert the signals to drive the TV as a CGA monitor.
-- Link to my "Computers for disabled Veterans" project website deleted after threats were telephoned to my church. Michael A. Terrell Central Florida
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I've seen it done, it's easier to just buy a proper monitor though, they'll usually have better convergence and geometry anyway.
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Not optoisolators, but most older arcade monitors do require isolation transformers.
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Arcade monitors are CGA resolution, but they're analog RGB just like a TV.
Then they are not CGA monitors. They are NTSC RGB monitors.
-- Link to my "Computers for disabled Veterans" project website deleted after threats were telephoned to my church. Michael A. Terrell Central Florida
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