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An update.
Still no luck. I have uninstalled and pulled the cards out, rebooted without them, put one back in at a time, installed different drivers, newest drivers, etc.
Interestingly I have discovered the graphics card (NVIDIA 8400 GS) is using the kind of address ranges I want for the LPT port. But, I cannot find any way of changing those allocations, in BIOS or Win7.
Tonight I'm going to attempt to get my old P4 XP machine running by replacing it's motherboard and power supply, and use that instead. See how I go.
Roger.
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