New find, Edax PDP 11/23 system available.

Tore Sinding Bekkedal toresbe at
Sat Jan 6 04:18:15 CST 2007

On Sat, 2007-01-06 at 04:33 -0500, Ethan Dicks wrote:
> On 1/6/07, Tore Sinding Bekkedal <toresbe at> wrote:
> > The terminal when seen from the side was shaped like an L, with the CRT
> > tube itself standing (in a plastic casing, of course) on the vertical
> > part of it. You could grab the CRT and twist it 90 degrees. The terminal
> > would send an escape code to the system, and the system would redraw the
> > screen with the altered aspect ratio.
> Nice.  More than just aspect ratio - somehow, hardware or software, it
> would have to change how it renders its bits.  I don't _think_ you can
> arbitrarily exchange horizontal and vertical deflectors on a CRT, but
> you could run a matrix transform on the bitmap in memory and change
> all the drawing routines to swap axes without too much trouble, I'd
> expect.

Yes, I believe that is what it did. Another bit of trivia was that it
was apparently very susceptible to burn-in. 

> > On Tuesday I'm going to a museum which has one of these...somewhere... -
> > I can try to get a picture of it, if you like.
> Please do.

I'll do my best. No promises, though - not my camera.

-Tore :)

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