>
>checked that first hon, spent 2 days on this fault :o(
>
>but the new chip fixed the fault, so I am guessing it is the old chip :o)

I had a PIO chip (essentially, the same I/O ports as an AVR, but for a 6502
system) that had reversed bit ordering after a lightning hit.  This PIO had
two ports used as digit strobes for a display, so the display spelled out
everything backwards.

Bit 0 came out on bit 7's pin, bit 1 on bit 6's pin, and so on, for both
ports.

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