Re: RGB/IIGS monitor prob

[supertimer@aol.com (Supertimer)]

jadedlord <qhdd86@hotmail.com> wrote:

>Hello.
>
>I read the RGB discussions and found them very interesting, however,
>didnt help me.
>
>I just recently got a used Macintosh 12" RGB Display monitor (M1299)
>that I was hoping I could use on my IIgs. So my first question is, will
>it work in the first place?
>
>When I first tried it, it had horizontal and vertical stabilizong
>problems, so I opened the case and fixed that(Ive had previous
>experiences). However, no matter what I do, I still have a picture wrap
>around, wrapping half way around. Also, there is two black columns with
>seems like blue lines have been inserted between every other line. Any
>help with this would be really appreciated. Thank you for your time.

The monitor expects a 30Khz signal but the IIGS generates
a 15Khz one.  That's why you have a wrap around picture.

There are two solutions.  Either turn the IIGS signal into a
30Khz one or drop the monitor down to 15Khz.  The first
option can be accomplished with either a Second Sight
SVGA card for the IIGS or an external Amiga scan-doubler
with appropriate adapter cable for the IIGS.  The second
one involves replacing certain components in the monitor
and should not be attempted unless you are a qualified
monitor technician.