Re: ISA Vector card already done...

> That *does* work, but I'm under the impression it's a little
> "unpredictable". If you have the color guns turned on and the beam
> sitting at one point (A), then "jump" the beam to another point (B), the
> beam will deflect to the new point as fast as the deflection amps allow
> it. (slew rate) Couple gotcha's:

> 1) the settling of the deflection amps can make the line "squiggly" at
> the end

Probably not, but the slowing down will cause increased brightness
at the end. That's why Cinematronics targets a point way beyond the
real end of the vector and then stops - the speed is more constant
if you only draw for a portion of the charging time.

> 2) the line might not travel in a completely straight line (a short
> vertical deflection will reach "point B" faster than the long horizontal
> deflection, so your "line" will be "L" shaped)

That'll only happen if the R/C constant for X & Y are different. Remember,
an RC circuit will reach the half-way point in a fixed amount of time, so
if X and Y have the same RC constant they will both reach 1/2 way to the
destination at the same time (also 1/4 of the way and any other fraction).
That's why the components are high tollerance, any variation will cause
curved vectors and the L shape clay speaks of. This combined with the
critical timing of turning the beam off (cinematronics) is probably why
Zonn can't get the vectors to line up perfectly.

-- 
 ___   __   _   _  _
|   \ /  \ | | | || |       phkahler@oakland.edu     Engineer/Programmer
|  _/| || || |_| || |__     " What makes someone care so much?
|_|  |_||_| \___/ |____)      for things another man can just ignore. " -S.H.