On the topic of the port B int on a 16C84...

Would I be right in thinking that setting or clearing B0-3 using bit
operations would mean a port read and write and hence clear any pending
interrupt for B4-7 change ?

The way I read it, I cannot use B0-3 for any I/O without risking loss of a
pending B4-7 change interrupt, which meant is was useful for getting out of
sleep but not much else.

Did I miss read the spec, or is this how it works ?

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