But Paul,

It fixed it.

All I did was turn on the port latch bit and I see 5V on the pin despite
the TRISB bit being 1 as well.  I can pull it down to ground too.

By the way, this brings another question up ... for long run DS-1820 one
wire bus signalling a more forceful pull-up is advised.  If I change my
code to pull the pin up hard for two microseconds, do I need to worry
about any side-effects?

e.g. (both bits were clear immediately prior)

        BSF     PORTB,0
        NOP
        BSF     TRISB,0

The alternative resistive pull-up would be

        BSF     TRISB,0
        BSF     PORTB,0

--
James Cameron   mailto:quozl@us.netrek.org   http://quozl.us.netrek.org/