Tektronix terminals

[Christian Corti]

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