Re: ISA Vector card already done...

"Anyway, if that's all it takes, then why not do the exact same to this
project in order to eliminate the high MIPS requirement (add low pass
filtering on the output stage)?"

Well, that's essentially what Paul just said. The way 'analog' vector
generators work is you set a starting vector voltage, and then start
charging a capacitor until you reach the ending position you want
(this is a gross simplification, which doesn't take into account the
non-linear charging time of a cap). A low pass filter is (again
grossly simplifying) almost the same thing (a basic low pass filter
is a resistor in series with the signal and a capacitor to ground)

There are two main types of deflection systems used in CRT's, electrostatic
and electromagnetic. Electrostatic deflection has plates that are charged
which deflect the electron beam, electromagnetic deflection systems use
electromagnets (deflection coils). Electrostatic deflection systems cannot
deflect a beam as far as electromagnetic deflection systems, but they can
change a beam position very quickly, since they don't act as current storage
devices the way that inductors behave.

again.. this is a gross simplification of the principles involved.
Received on Wed Mar 25 15:14:11 1998