> given recent advice on the fact that portb interrupt on change
> can be unpredicatable

There have been one or two longish threads on IOC that I recall
determined it is normally OK to use. But it does have some quirks.
The last thread was a while ago, perhaps one of the posters then
can point you at a date so you can read the full story. I notice that
the F628 manual has more info on IOC than the F84 manual

> I have decided to use RB0/INT instead

> is it ok to simply connect the signal lines from each encoder
> directly to RB0 or do I need some additional circuitry ?

If they are positive-going then you can put a diode in series with
each (wired-OR), cathodes to RB0. If they are negative-going,
invert each with a transistor or gate. A 2-input NOR for example

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