rrw@naucse.cse.nau.edu (Robert Wier) (04/09/91)
Ok, you guys did really well with answers on my EGA gray scale
question (the general consensus was that you can get 4 shades of
gray with an EGA, but you really need to do to a VGA to get more).
Now, working on the same project I've run into a snag using the
COM port. We have a situation where we don't know when the
data will appear - it can be anywhere from 100 ms to 11 seconds
after the previous carriage return.
The problem we are having (my students are currently using
Quick-C) is that when you go out to read a character and there
isn't one there yet, the port seems to "time out" in 1.5 seconds
or so. I can't find any way to defeat this, although I certainly
see why in most circumstances it would be useful.
I know it CAN be done, because Kermit does it. The big K just
sits waiting patiently for something to arrive and display it on
the screen.
Does anyone know how to do this? Does it require going directly
to the UART and bypassing the built in routines? Or is there
something actualy in the hardware in the nature of a switch
which has to be reset?
Please E-Mail or post.
THANKS
- Bob Wier
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College of Engineering
Northern Arizona University / Flagstaff, Arizona
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