>I know that there is a 20 mA/pin source limit on the '64, but is there
>a per port or per chip limit on current sourced?
>
>In short, can I directly run two 7 segment displays (one per port, ~10 mA
>per segment) continuously without a problem?


Current limits of this nature are specified in the "Absolute Maximum
Ratings" section of the data book:
    Maximum output current sourced by any I/O pin: 25 mA
    Maximum current into Vdd pin: 250 mA.
    Maximum current sourced by PORTA, PORTB, and PORTE (combined): 200 mA
    Maximum current sourced by PORTC and PORTD (combined): 200 mA
etc.

So it looks like a total of 140 mA from two ports at 10 mA per pin is OK.
Since the pins are lightly loaded, there should be very little Vdd-Voh and
you won't be close to the total power dissipation limit of 1 Watt (even if
Vdd-Voh were a full 5V, the power dissipation would be .01A * 5V * 14places
= 700 mW).  The only difference between source and sink current limits
regards the Vdd and Vss pins.  Assuming the current through the PIC logic
itself is negligible, you can source a grand total of 250 mA per chip, or
sink 300.  This would presumably require splitting the heavy loads up
inbetween the A,B,E group and the C,D group.

-Mike