OUTPUT will
set
the Port 0 pin corresponding to expression to an output.
With the SuperPRO and PROplus, NXP has added more configurable port pins. We are adopting their convention for control of those pins. FIO0DIR, FIO1DIR, FIO2DIR, and FIO4DIR control the input/output status. Writing 1 to a bit will make it an output. More details in the NXP user manuals.