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You can't bit-bang the LPT port with a USB-LPT adapter easily.
We had issues using the LPT port for our window/doorlock controller, and we solved it using our DSSC. We don't provide power to the board until after the PC has booted. Hell, it's one of the reasons we designed the DSSC to have that functionality.
That said, your probably better off just going USB and cutting your losses and doing a redesign. Parallel ports are a dying breed, and it's not wise to develop a product for dying technology.
Just my .02 cents...
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