1 Jul
2006
1 Jul
'06
8:35 p.m.
der Mouse wrote:
i thought the goal was to have very *little* (none) electronics -- since
someone would have to design/build it...
> 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 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.