Vector Imagery

[Don Y]

der Mouse wrote:
>>> And I doubt the parallel port would be fast enough.  Best plan would
>>> be a pair of DACs, a counter and a 16-bit EPROM (or a pair of
>>> 8-bits).  Program the ROM with the pattern data, hook up a display
>>> and have fun.  [...]
> 
>> The "problem" here is you can't easily change the "display".
> 
> Then use RAM instead of ROM, and add a little electronics so that the

i thought the goal was to have very *little* (none) electronics -- since
someone would have to design/build it...

> host can grab control of it long enough for a write cycle.  The display
> will glitch while you write, but for the thing as described that's no
> biggie, since you'd write very seldom.  If you have intensity control
> on the 'scope, you could even use the write signal to turn the beam
> off, so glitches would be less visible.

Actually, this will be VERY visible.  I.e. try updating
a raaster scan display without watching where the scan is
currently.  You end up with weird visual artifacts.