> The problem is the PIC IRQ hardware never sees the PSPIF
> in PIR1

Had exactly the same problem with F88 I2C data reception flags.
First byte would not get a reaction (subsequent bytes would). As
the first happened to be the chip address, made rather a mess of
things in a multi-chip layout

> I suppose I could write a polling routine, but this should work!

> Ideas?

Polling is what I had to use. Fortunately with I2C there are several
flags that can indicate the same or similar conditions

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