I have done a couple of things this morning with interesting results. I commeneted out the RD and RE parts of the code and tried running same code on my SX-28. No Pullup present. Yet when I run the same code on sx-sim I see all 1's on all inputs with nothing connected. I also used the same code on all ports to set them all to inputs with pullup. No port is responding. Is the problem the order in which the code is being fed to the mode register? I would not think so but....
As far as using external pullup, that increases my parts count far more than I would like!
I am scratching my head and with little hair that is hazerdous to my scalp!
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