Re: New Vector Monitor Project: LM3886 & overscan

Wouldn't worry too much about it. You spend so little time off screen (and the
chip has protection against overload anyway) that I doubt it would be a problem.

Clay Cowgill wrote:

> 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 14:54:11 1999