joy port question

Okay.. Sorry to keep beating a dead horse.. but about the joy-ports. When
the keyboard scan takes place, if I heard this right, only one port is
turned to output? It occurred to me since my LED routine I made on the
user-port actually runs on the interrupt service routine, I shouldn't have
to worry about the keyboard scan interfering with it. However, if the port
ever goes to output mode other than when I want it to, arbitrary junk may
get sent to my shift register. So which port would I be safe connecting it
to? If I can make it work on my real C64, then I might also try it on my
DTV.
.

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