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From: Steve Lewinsky on 1 Aug 2005 11:51
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?


From: Sam Goldwasser on 1 Aug 2005 13:28
"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.

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From: Ken Weitzel on 1 Aug 2005 14:05


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.

Take care.

Ken

From: Michael A. Terrell on 1 Aug 2005 15:11
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.

--
Link to my "Computers for disabled Veterans" project website deleted
after threats were telephoned to my church.

Michael A. Terrell
Central Florida
From: James Sweet on 6 Aug 2005 15:20

"Steve Lewinsky" <coinop(a)rogers.com> wrote in message
news:pZadnQ31dfdU2XPfRVn-sA(a)rogers.com...
> 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?
>
>

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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