Where have all the Selectrics gone?
Roy J. Tellason
rtellason at blazenet.net
Sat Mar 25 15:32:28 CST 2006
On Saturday 25 March 2006 04:07 pm, Tim Shoppa wrote:
> "Barry Watzman" <Watzman at neo.rr.com> wrote:
> > All selectric mechanisms, at the mechanism level, use tilt/rotate code.
> > You tilt the ball to select a row, and then rotate it to select a column,
> > then whack the paper through a ribbon (it's a mechanism that Tony Soprano
> > would love). That is simply how a selectric works, and any other code
> > will ultimately get converted into tilt/rotate before being applied to
> > solenoids in the mechanism.
> I believe that one of Don Lancaster's logic cookbooks shows how to
> convert ASCII to tilt/rotate codes. Either that or some mid-late-70's
> Radio Electronics article that also tells how to use surplus core
I remember him doing something with converting either to or from Baudot code
(5-level), but not selectric...
Of course, I still don't have a copy of the RTL cookbook, and I suppose it
could be in there. :-)
> The one Selectric that I saw converted just used a bunch of solenoids
> to whack the keys on a plain old keyboard.
I remember some outfit selling those way back when.
> Did any micro hobbyists actually succesfully use surplus core? I remember
> it somewhat cheap (but not ridiculously cheap)
> in the Meshna catalog etc. but never saw it being used. It is not
> a trivial matter to time and calibrate all the drive and sense lines
> especially when it's some random core plane and the first you ever
I never really thought of actually using one, but thought that it might be
kind of neat to have one of those to hang on the wall. :-) And yeah, I
remember those Meshna catalogs too.
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, a critter that can
be killed but can't be tamed. --Robert A. Heinlein, "The Puppet Masters"
Information is more dangerous than cannon to a society ruled by lies. --James
More information about the cctech