Re: New Vector Monitor Project: LM3886 & overscan

James Nelson wrote:
>
> On second thought, There is probably only one correct way to eliminate the
> "secondary emission": sample the x&y inputs, and when they go beyond a
> setpoint, enable a fast spot killer. Unfortunately, this would add about a
> dollar or two to the price of the monitor. It's not clear to me if this is
> a good or bad idea.

The 'secondary emmision' caused by deflecting off the screen shouldn't be a bad
thing as long as it is a short duration? I like the star wars 'screen flashes'
:-)

If a digital protection scheme is made, maybe a small 16 pos BCD switch could be
added to the controller to make a 16-step adjustable digital input clamper?

jess

>
> James
>
> ----- Original Message -----
> From: Clay Cowgill <ClayC@diamondmm.com>
> To: <vectorlist@lists.cc.utexas.edu>
> Sent: Monday, November 08, 1999 5:49 PM
> Subject: RE: New Vector Monitor Project: LM3886
>
> > > The "flash" you talk about is probably what's called "secondary
> emission"
> > > and is
> > > caused by the beam hitting outside the screen and knocking loose more
> > > electrons
> > > that then hit the screen and cause an unfocused glow.
> > >
> > > Is that what you're talking about? (This would be SO much easier if I
> > > hadn't
> > > sold my games---have to work in the dark).
> > >
> > Yep,
> >
> > They're deflecting way off the screen with the color guns on thus
> resulting
> > in the whole screen "brightening" slightly. (Not huge, but noticeable--
> > supposedly it's intentional. ;-) It looks like the background black-level
> > coming up maybe 10-20%...
> >
> > -Clay
> >
> >
Received on Mon Nov 8 23:01:32 1999