serin2/serout2

[skimask]

Just a quick question, using a 16F628A, does it make any difference which pin I use on porta or portb and on pin porta.4 would there be any issues using it for serin? Thanks

Doesn't make much of a difference....but it could.
Some pins are TTL, some are schmidt trigger inputs...if your voltages are marginal, some pins might respond while others don't.
All pins are CMOS outputs, except RA.4 which is an open-drain, which could be an advantage in some situations.
Info on this is in the Electrical Specification section of the datasheet.