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660x DIO Register Level Programming

I am working on a comedi/linux driver for the 6602, and can't figure out how to access the other 24 DIO lines (the ones shared with counter/timer).
Firstly, I want to use the DIO lines for output, so I must configure them as such. The RLPM doesn't say anything more than a hint about how to configure these lines .
It seems the answer lies in using 2 bits to set to IO_Config Register(s). The RLPM says that these registers contain 2 bits for configuration direction, but only lists functionality for 00 and 01; not 10 or 11. Is it possible that setting 11 or 10 sets these PFI lines for DIO?
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