10 Feb
2007
10 Feb
'07
5:12 p.m.
> There also was a 'write through' mode,
> again, not sure if it was a hack, or part of the production terminals,
> that would (within the limitations of the RS-232 port) could do simple
> dynamic (non-stored) vector graphics.
It is also on the 4010. The 4010 and the 4014 have a
card cage into
which you can insert your own cards.
I have a 4010 and didn't see any mention of this in the manual. Do you
know if it took special cards?
At the very least it would be interesting to
add a USB port to the Tektronix this way to give it a higher serial
transfer rate. The number and complexity of the dynamic vectors that
you can draw is currently limited by the baud rate on the port.
On the 4010 you can exceed the draw rate for stored vectors when running
at 9600 baud and you don't sent the unchanged bytes in the coordinates.
I was trying reduce the draw time to make a better demo and found that
long vectors wouldn't line up properly at 9600 when several of the bytes
didn't need to be sent.
11 Feb
11 Feb
9:41 a.m.
New subject: Tektronix terminals
On Sat, 10 Feb 2007 djg at pdp8.net wrote:
I have a 4010 and didn't see any mention of this
in the manual. Do you
know if it took special cards?
The 4010 has a bus that normally contains the three cards TC-1, TC-2 and
TC-3, along with the fourth card at the left (but that isn't connected to
the bus on the backplane the same way). You can extend the bus and hook up
whatever you like, there's a detailed description of the bus signals in
the manual.
On the 4010 you can exceed the draw rate for stored
vectors when running
at 9600 baud and you don't sent the unchanged bytes in the coordinates.
I was trying reduce the draw time to make a better demo and found that
long vectors wouldn't line up properly at 9600 when several of the bytes
didn't need to be sent.
That's true, I too have made the same experience. Running gnuplot (or
anything else) at 9600 baud will produce garbage on the screen. You need
to run the terminal at 4800 baud.
Another unrelated question: The 4010 I got needs an awfully long time
until it will fully erase the screen (at least 20 minutes). When it's cold
it will only erase the center in the shape of a (distorted) circle, the
corners won't be erased. Is this a typical sign of a used CRT? I know the
main heater and cathode (for the writing beam) are fine, I suspect the
collimation electrodes or the flood gun. Does anyone have experiences with
that problem, is there any cure (e.g. a longer flooding time) ?
Christian
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