I went through the mailing list archive and I saw one recent thread on
this. The info I needed wasn't really there.
I am doing vision research where I present a visual display (drifting
grating embedded in Gaussian white noise) and get a response (button
press) from a human observer. The timing is important: for the graphics I
would like to present at some frame rate (e.g. 100 Hz) and know that is
the true value with no frames displayed twice or skipped; for the
response, I want ms resolution or better.
I would like to get the response via a telegraph key hooked up to the
parallel port (debounced in software).
I think using rtlinux for the response would be pretty trivial. But the
graphics? I am currently using MSDOS with djgpp/Allegro for making my
displays. I have no worries about the graphics on this platform. But I do
have worries about the response collection. I am wondering if rtlinux
would be a solution. (Otherwise I have to read a lot more about disabling
interrupts under DOS so I can rely on the timing). The big snag is the
graphics. Certainly X would not be the way to go. Does anyone know how to
go about doing double-buffered realtime animation under rtlinux?
Thanks for any help!
Bill
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