RE: New Vector Monitor Project: LM3886 & overscan

Ehhhh, it's supposed to be a feature, so I'd leave it. On the other hand--
if clamping the maximum deflection range to protect the monitor resulted in
a more robust monitor design but as a side effect resulted in the removal of
the secondary emission "feature" I wouldn't be crying about the loss... ;-)

-Clay

> ----------
> From: James Nelson[SMTP:nelsonjjjj@didactics.com]
> Reply To: vectorlist@lists.cc.utexas.edu
> Sent: Monday, November 08, 1999 8:44 PM
> To: vectorlist@lists.cc.utexas.edu
> Subject: Re: New Vector Monitor Project: LM3886 & overscan
>
> 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.
>
> 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 Tue Nov 9 14:13:08 1999