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From: James Sweet on 6 Aug 2005 15:20

"Ken Weitzel" <kweitzel(a)shaw.ca> wrote in message
news:_vtHe.82466$5V4.1839(a)pd7tw3no...
>
>
> Sam Goldwasser wrote:
> > "Steve Lewinsky" <coinop(a)rogers.com> writes:
> >
> >
> >>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.
>
> Hi Sam...
>
> I respectfully submit that the result could be a serious
> safety issue...
>
> I believe they do (or did) require opto isolators.
>
>

Not optoisolators, but most older arcade monitors do require isolation
transformers.


From: James Sweet on 6 Aug 2005 15:21

"Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote in message
news:42EE73B5.E8BF7A7B(a)earthlink.net...
> Steve Lewinsky wrote:
> >
> > 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?
>
>
> 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.
>
>

Arcade monitors are CGA resolution, but they're analog RGB just like a TV.


From: Michael A. Terrell on 7 Aug 2005 05:33
James Sweet wrote:
>
> 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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