15 Sep
2003
15 Sep
'03
4:07 p.m.
On Mon, 15 Sep 2003, Gene Buckle wrote:
When you say CRT do you mean just the tube or the whole display system? There
is no such thing as a raster CRT if you are only talking about the tube. The
raster aspect concerns the surrounding electronics and deflection yoke (if
magnetic)
If you have to drive a 4" round tube and you need to make the electronics then
why not just raster scan an electrostatic CRT with VGA timing. No need to do
the vector hardware, as the sweep generators to do raster scan would be easier
to do than the vector generator, and you would be VGA compatible on the
computer side.
there is a
arcade game emulator called "mame" that has emulation of
vector graphic but uses ordinary raster scanned (runs on normal vga).
You'd have a lot better maintainability and quality if you took a regular
vga monitor and wrote code to take in your vector plot data and made
a custom driver for a "game" that mame could run which would paint
your vector stuff on the screen.
You would use a 5": vga color painting green lines, and would restrict
the thing with a mask in the software to keep it in the confines of the
console punchout's geometry. I would think that even the air force
might options such a product to replace their units...
Jim, the vector requirement is one of hardware, not software. Trust me,
if I could buy a 4" round raster CRT, I'd jump on it. The whole problem
is due to the size constraints. that I'm faced with. A 5" CRT is actually
too large to be properly fit within the confines of the original
enclosure. I therefore have to use a 4" tube from an oscilloscope as a
replacement. To my (limited!) knowledge, no one makes such a thing in a
raster drive configuration.
If you look at http://www.f15sim.com/images/tews_teardown_sm.jpg (view
tews_teardown.jpg for a much larger image) you'll see what I have to work
with. Due to screen burn on the CRT, I've discovered that there are
quadrant marks that are painted along the edge of the CRT circumference,
much like a clock. This means that for my simulation to be correct, the
replacement must be round. A square tube or LCD would give far too small
an image. I'm going to write the driver software myself, but I have to be
able to drive the screen first. :) If I could find a ready-made NTSC or
VGA to vector converter, I'd be set.
Thanks!
g.
Peter Wallace
