4 Aug
2014
4 Aug
'14
11:25 a.m.
On Aug 4, 2014, at 2:12 PM, Rick Bensene <rickb at bensene.com> wrote:
There have been a lot of comments about this thread,
all of which I
appreciate.
Here's some more information:
-> There are definitely two pairs of wires going into the coils around
the neck of the CRT. Both of these pairs of wires terminate on the
circuit board that has the deflection amplifiers on it.
Sure sounds like magnetic deflection.
...
From what I have read in the comments, it seems that electrostatic
deflection would be the likely candidate for this type of display. The
coils around the tube, though, tend to indicate magnetic deflection.
Electrostatic is traditional for this, but magnetic deflection for a stroke display has
certainly been done. As I mentioned, CDC had one of each in their mainframe consoles:
electrostatic in the first generation, magnetic in the second. And those displays had a
harder job, because the characters were plotted in an unpredictable order as opposed to an
order fixed in the circuit design as I would assume for your calculator.
paul