I've written my own routines for this several times for different
processors, it's not overly complicated.
if you choose the "tie the R/W line low and simply wait long enough" route,
(which I've done)
do note that the "long enough" portion is temperature dependent - it takes
longer when cold.

Also, when you're deciding which pins to control it with... You can control
it with any pins, but it's a
fair bit simpler if you use four (or eight) pins from the same port in
order - much less bit manipulation.
I've done it with pins scattered all over when I had too, it can be done.
Now it's number three on my
PCB design checklist. (right behind Do you have mounting holes? and There's
nothing on the
PGC/PGD lines)

-Denny
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