I am working on a project at the university on writing a software on how we can control 2 boards from the parallel port of a computer, one board has 8 output relays and 8 TTL, and the other has 8 inputs to the computer.
The program consists on :" reading data from the 2nd board and storing that in a file", or "switching on the relays of the first one or it's TTL's".
The choice between the relay or TTL is made by software,and when I am working on the first board, if data comes from the second one it has to wait in a buffer so that we can continue working with the first one without conflicts.
My program should be written in C++.

Any help you can give is really very appreciated,
Thank you in advance.

check out boondog.com for tutorials

first you have complete specs of the printer port pin con, address range(0378H - 037fh), aslo specs of the relay, get a proper relay driver circuit from the net and also get a transistor circuit amplifier that would amplify the 5v output to the required voltage and current to drive the relay. for input use a dip switch and connect it to a buffer like 74ls373.

: check out boondog.com for tutorials
:
: first you have complete specs of the printer port pin con, address range(0378H - 037fh), aslo specs of the relay, get a proper relay driver circuit from the net and also get a transistor circuit amplifier that would amplify the 5v output to the required voltage and current to drive the relay. for input use a dip switch and connect it to a buffer like 74ls373.
:
:
I get the impression that not only is this homework, but the boards are already built, he simply needs the program.