Parallelport interfacing in Direct RT

How do I interface the parallelport in Direct RT?

I've got some external hardware that sends TTL signals to the parallellport.

Using the TTL I/O test program at port 889 I get these codes:

Button code
1 8
2 16
3 32
4 64

When running the attached experiment it stops and it seems it doesn't get any input from the parallelport. Have you got any ideas?

Any feedback will be appreciated!

I think it's probably because the first trial has no visual stimulus. Try the attached revision and see if that fixes it.