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Hello, the docs say that DirectRT can send TTL signals through a PC port, but I can't seem to find any reference as to which pins on the port carry the TTL signal. I need this information in order to build a custom electrical circuit that would receive these signals. Any help will be appreciated.
I'd refer you to this excellent overview:
http://retired.beyondlogic.org/spp/parallel.htm
Summary: pins 2-9 are the data bus output. Pins 18-25 (inclusive) are ground.
And also double-remember that these signals are quite weakly buffered. Add some current limiting resistors, and watch out for accidental short circuits.
Thank you, much appreciated.
