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There is no analog input on the 7I95/7I95T so maybe an
encoder would make more sense for feed rate override.
You could use either one of the high speed encoders or
one of the 4 MPG encoders built into the isolated I/O.

Note the both MesaCT and the very latest pncconf
( in LinuxCNC master ) can make  configurations for the
7I95/7I95T.

Parrallel port has failed on my old computer , running Ubuntu 10.4 and EMC2 2.4.6 . Milling machine has Pico USC , Microkinetics Steppers , Linear Scales for Position feedback.  Old computer is a mishmash of crap that has no network capabilities.
I need the easiest upgrade path , for a computer and Software . Im old and not very tech savy!  I may go to a Mesa board if it would make things easier. Any and all recommendations!