> Microchip never refers to it as a resistor

Yes, that's very true. I was careful to say the current equates to a
resistor of a particular value at a particular voltage (which is also
what is specified in the datasheet). The block diagram, admitedly
simplistic, indicates a P-ch FET that behaves as a resistor. If it
were a true (constant ?) current source you might expect the voltage
spec to be wider

Allen, as you've probably worked out, many of the older PICs
have pull-ups on just 4 bits of PortB, a legacy feature for 4x4
keypads. More recent PICs have pull-ups on most pins

Joe
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