> TRIS is the direction register...but how do you actually set PORTB,3 to be
> tristated,

    dbankif trisb      ;make sure banks set for access to TRISB
    bsf     tribs, 3   ;set RB3 to high impedence

> then set for an output,

    dbankif trisb      ;make sure banks set for access to TRISB
    bcf     tribs, 3   ;set RB3 to be an output


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