Where have all the Selectrics gone?

Roy J. Tellason rtellason at blazenet.net
Sat Mar 25 15:35:35 CST 2006


On Saturday 25 March 2006 04:28 pm, Keys wrote:
> It's covered in the first ed. 1976 TV Typewriter Cookbook with green cover.

Ah.  I have that one,  but it's been a *long* time since I looked at it.  :-)

Also cheap video,  and son of...

> ----- Original Message -----
> From: "Tim Shoppa" <shoppa_classiccmp at trailing-edge.com>
> To: <cctech at classiccmp.org>; <cctalk at classiccmp.org>
> Sent: Saturday, March 25, 2006 3:07 PM
> Subject: Re: Where have all the Selectrics gone?
>
> > "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
> > memory...
> >
> > The one Selectric that I saw converted just used a bunch of solenoids
> > to whack the keys on a plain old keyboard.
> >
> > 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
> > saw.
> >
> > Tim.

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