vector graphics monitor ?
rich12345
Could a TV or apple II monitor be converted to do this? Could it be
modified to do raster graphics (AND/OR) vector graphics?
What would it take to control a vector monitor? Two DAC's ?
Michael J. Mahon
> I would like to play with vector graphics video monitor.
>
> Could a TV or apple II monitor be converted to do this? Could it be
> modified to do raster graphics (AND/OR) vector graphics?
The modifications would be extensive--not really worth doing.
Both the vertical and horizontal sweep systems of a conventional
monitor are useless for a vector display, which must support high
bandwidth deflection on both axes.
It is further complicated by the fact that in a conventional monitor
the high voltage is derived from the constant-frequency horizontal
sweep circuits, so another HV source would be needed.
Vector scopes are different animals entirely.
> What would it take to control a vector monitor? Two DAC's ?
Any oscilloscope can be used as a vector scope by driving both
axes from DACs. However, to generate straight lines, integrators
must be used on the DAC outputs to cause both the horizontal and
vertical components of a vector to end at the same time (and at
the end point of the vector). You'll also need to generate an
unblanking signal during the duration of the slew.
If all you need is the _points_ at the ends of the vectors, you
don't need to control the slew rates, but only detect when both
axes have settled to momentarily unblank the beam to display the
end dot.
If you need the whole vector, then the slew rates must be controlled
as described above to get straight lines.
Doing this at high speed with magnetic deflection requires some
fairly tricky circuits, and is always a compromise between speed,
power, and accuracy.
Long vectors will, of course, take longer to draw than short ones,
so software will, in general, need to poll the display to determine
when it's ready for another vector.
-michael
NadaNet 3.1 for Apple II parallel computing!
Home page: http://home.comcast.net/~mjmahon/
"The wastebasket is our most important design
tool--and it's seriously underused."
Calibrator
>
> I would like to play with vector graphics video monitor.
Perhaps the easiest way:
Get a Vectrex and start developing homebrew for it.
bye
Marcus
Bill Garber
"Calibrator" <calib...@freenet.de> wrote in message news:3c7a8e5f
-4281-4930-9d1...@j13g2000yqj.googlegroups.com...
That is a vector display? Cool. I will need to get mine out
and have a play day with it. 8^)
Bill