21 Jan
2009
21 Jan
'09
9:15 a.m.
On Wednesday 21 January 2009 06:19:57 Tim Shoppa wrote:
A regular VT-100 puts out composite/RS-170 video on a
BNC jack on the back.
(Classic problem from a few decades ago: people plugging the school's
thinnet ethernet onto the VT-100 video out connector!)
I don't see any BNC's on the back of Francesca's Franken-VT-100. But
I'd be pretty sure the Ball Brothers unit just takes the composite video
in.
Didn't some early regular VT-100's use Ball Brothers screens and flybacks
too? I remember a couple variations of the CRT/flyback boards some more
reliable than the others. Somewhere I've got pictures of my garage
completely filled with VT-100's!
Hi actually it does have those BNC's and yes when I was working at JPL back in
the old days I had to explain to a person in charge of one of the computing
department's that in fact they could not create a network series of VT-100's
using the then new Thin Net network being installed lab wide. :-)
The problem is the small size of the tube actually. Now the part that is broke
is the neck. I am thinking maybe I can find a smaller CRT from a scope or so
to replace it. But that would be after I tear this thing apart since the label
for the crt itself is of course upside down and blocked by the flyback/scan
board. I do see a E C as a possible company name on it.
--
Kindest Regards,
No Problems Only Solutions
Hosting Admins
Baltimore, Maryland
21 Jan
21 Jan
9:24 a.m.
--- On Wed, 1/21/09, Francesca C. Smith <fsmith at ladylinux.com> wrote:
The problem is the small size of the tube actually.
Now the
part that is broke
is the neck. I am thinking maybe I can find a smaller CRT
from a scope or so
to replace it. But that would be after I tear this thing
apart since the label
for the crt itself is of course upside down and blocked by
the flyback/scan
board. I do see a E C as a possible company name on it.
What's the size of the tube? The real VT100 had a 12" tube, but I don't know
about your VT100 clone. You should be able to rob a tube from another terminal, or a
portable B&W TV set and replace it. If it's a 9" tube, hunt down an old
security monitor. A scope tube isn't going to work - those use drastically different
deflection angles (and in some cases electrostatic deflection).
-Ian
2:16 p.m.
The problem is the small size of the tube actually.
Now the part that is broke
is the neck. I am thinking maybe I can find a smaller CRT from a scope or so
Most, if not all, small 'scope CRTs are electostatically (rather than
elecromagnicatlly) deflected. Tryign to get one of those to work in the
terminal is going to be a _lot_ of work (I am not going to say
'impossible', but it's certainly mot plug-n-play).
There were some small 5" portale TVs sold in the UK a couple of years
back. Maybe a CRT from one of those could be shoehorned in.
-tony
22 Jan
22 Jan
1:39 p.m.
On Wednesday 21 January 2009 02:16:50 pm Tony Duell wrote:
Yes, the differences in deflection angle would tend to make packaging
um, "interesting" to say the least.
The problem is
the small size of the tube actually. Now the part that is
broke is the neck. I am thinking maybe I can find a smaller CRT from a
scope or so
Most, if not all, small 'scope CRTs are electostatically (rather than
elecromagnicatlly) deflected. Tryign to get one of those to work in the
terminal is going to be a _lot_ of work (I am not going to say
'impossible', but it's certainly mot plug-n-play). There were some small 5" portale TVs sold in the
UK a couple of years
back. Maybe a CRT from one of those could be shoehorned in.
I'm not entirely sure of the size, but there is one of those small TVs
sittign in my scrap pile. It'd been left outdoors so the electronics are
probably not worth salvaging much out of, but that shouldn't bother the tube
any. If the OP wants to contact me offlist I'll see about digging into it
one of these days...
--
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"
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Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin
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