M
mike
- Jan 1, 1970
- 0
I bought a TEK 464. Made it work in non-store mode.
In variable persistence mode, best I've been
able to do is get it to store in a ragged oval
area in the center of the screen. Have not
been able to get any storage in fast mode.
Voltages and timings on the CRT seem to be ok
except that the manual claims there should be
some pulses on the front mesh in VP mode.
What I have
is a small triangular wavetrain. The pulses
are pulling up, but there's no obvious
current path to pull down. I see what I'd
expect from the circuit, but not what
the manual says.
Is there some magic I don't know about, or is
my CRT bad?
Here's a picture of the screen:
http://mike.liveline.de/pictures.html
In variable persistence mode, best I've been
able to do is get it to store in a ragged oval
area in the center of the screen. Have not
been able to get any storage in fast mode.
Voltages and timings on the CRT seem to be ok
except that the manual claims there should be
some pulses on the front mesh in VP mode.
What I have
is a small triangular wavetrain. The pulses
are pulling up, but there's no obvious
current path to pull down. I see what I'd
expect from the circuit, but not what
the manual says.
Is there some magic I don't know about, or is
my CRT bad?
Here's a picture of the screen:
http://mike.liveline.de/pictures.html
