8051

I am using Atmel's 20-pin 8051. My question is how do I assign Port 1
as an output, becuause once I program the chip I have to reset it once
to get it to not have P1 floating. After the reset it works fine. I
don't assign the P1 direction one way or the other for now.

On the Motorola 68HC11 I would use the data direction register, but
with the 8051 what do I do?