Re: Anybody with an oscilloscope as an Apple II display?

["Michael J. Mahon" <mjmahon@aol.com>]

On Mar 25, 9:51 am, heuser.mar...@freenet.de wrote:
> Something on the line of this here:http://www.youtube.com/watch?v=s1eNjUgaB-g
>
> Maybe not as detailed but is it feasible at all?

You need dual D/A's to generate such a display.  The speed with which
the outputs
can be changed--which soon becomes the speed with which the outputs
can be
computed, is what limits the complexity of the display.

Although it is possible (with appropriate analog post-processing) to
generate
a straight line segment by sending just the new end point (a vector
display),
in practice one would send several intermediate points so that simple
low-
pass filtering would produce the desired trajectory.

It's actually an older form of computer graphical output, since it
preceded
raster graphics by a decade or more.

-michael