HSERIN & Interupts (aka controlling PIC programs from a remote PC)

[HankMcSpank]

Which pin are you connected to for RX?

It looks like you are trying to set RB6 as INPUT, as if that were the RX pin.
But RX is on RB5.
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That's a good spot. The config part (setting up ports etc), was a straight lift (cut/paste) from a non-interrupt based HSERIN test program that I have which works fine. You are quite right that on a 16f690 PIC, the RX pin is RB5

Fortunately, I am actually connecting to RB5 for my RX (& like I say, I have a program where the whole HSERIN/HSEROUT kit & kaboodle works with that same config). I guess this is where I 'got lucky' & the PIC has defaulted RB5 to being an input? So alas, I don't think that's my problem

I actually think the port setup, registers etc are ok (on account it being a straight cut/paste from an HSERIN/HSEROUT worker) ...what I think this is likely to be is a lack of understanding what I should be matching against? (ie if mybyte="1" then what does a key press "1" get stored in a byte as etc)