9 Nov
2012
9 Nov
'12
12:16 p.m.
I think Tony's point (pathological corner case
though it is)
is that a B&W CRT *can* display color with such a filtering
device; it's how early color TVs worked. The SE/30 has no
Precisely. Yes, I was being facetious. But when somebody claims somehtign
is impossible, I immediately wonder if there's a way to do it :-)
There were many scheams tried for colour TV displays before the design of
the shaddowmask CRT. One that I rmemebr reading about hformed the image
on a thin miga screen _inside_ the glass envelone. The screen was ridges
on one face. The to side of each ridge was coated with one colour
phosphor, the bott side with a diffent colour phosphor and the back of
the screen with a thirt colour. There were 3 electron guns in necks
coming off the bulb, each aiming at one of the phosphors. Each had its
own defleciton system. I'll bet settifgn that up was a nightmare.
method for doing so on any existing video controller,
though
I suppose one *could* make such a card if one were suddenly
in possession of far too much spare time.
One microprocessor-based consumer device did use a spinnin gwheel of
colour filters between the user's eyes and a monochrome CRT to get colour
and even 3D effects (by allowing each eye in turn to view the same
screen). Teh Vectrex, of course.
-tony