Lear Siegler ADM-5

22 Sep 2014

...
     when switched
off, the display colpases into a very bright
 vertical line and then to a single point in the center of the
 screen.  [...] 
 This is not normal [...] 
 [...]  It may be normal.  It
depends on how the various power supplies work.  Old T$ 
I've seen raster-scan CRT devices relatively often do this, but with a
horizontal line.  I've never seen one do it with a vertical line
(though it wouldn't surprise me to see it if the monitor were rotated,
ie, its fast scan were vertical and its slow scan horizontal).  Getting
a vertical line means vertical scan is still going but horizontal scan
isn't, and I've never seen the slow scan outlast the fast scan.

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Lear Siegler ADM-5