> Has anyone else used one or the other of these hunks of code? Is one
> approach (software timing  or interrupt timing) clearly superior to the
> other? Is there other serial code out there I should be looking at?

I have some MPASM asynch send/receive code (busy waiting) in the sources
for the WISP programmer
(www.xs4all.nl/~wf/wouter/pic/wisp).
Software timing is very easy but you can not do anything else in the
meantime,m
so use it unless you need to do something else at the same time.
For receiving I sampled the signal as often as possible, this gives
excellent
noice reduction (but is not possible with interupts).

regards,
Wouter.