If I read your post correct, it's very easy to "read" everything you mentioned using relais. Simply let the items you want to monitor drive the relais, attach 1 dataline from your lpt port to all the relais (contact-in) and connect all the contact-outs from the relais to the data-in pins from your LPT port. Write a 1 to the specific dataline from the LPT port, and read out the data-ins....
It's that simple
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