A couple of things that could be an issue. Just because one machine worked in ecp mode, doen't mean the other one will. There are 7 ecp modes. If you use the machines parallel port for nothing else, set it to SPP in the bios settings. WinXP will use the bios settings. The other as per the above replies is does the breakout board have pull up resistors to 5V? If not you will probably have to add them.
Phil, Still too many interests, too many projects, and not enough time!!!!!!!!
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