I have a project that requires 4 16C84 pics to receive data from one
source
serially.  That is to say the Port B lines would have to be either
connected
directly together or via a OR series of gates.  The premise is that I
want the
4 pics to be listening for commands sent by one common radio and then
subsequently one would wake up when its ID code was detected and then
respond to the command by doing its task.  After the task is completed
then
it would send back serially via radio through one common Xmit line
connected
to all 4 pics.  Can I connect the pics received and xmit lines up
directly together
or should I isolate them all from each other via CMOS LOGIC chips?

I have one main controller Pic #1 that will be controlling the power of
each of the
other 3 Pics.  So the controller Pic #1 is turned on by DTR on a reset
line.  It reads
the initial traffic.  If Pic #2 is needed to do a task Pic #1 turns on
the power to
Pic #2 and then Pic #2 goes into listen mode.  The radio traffic is
sent.  Pic #2 reads
it and does its task and sends the response back via radio.  Pic #1 is
told via radio
to shut down Pic #2's power.

I have read some threads in this list that talk of drawing power from
other pins
even though power is off on the Pic #2, Pic #3 and Pic #4.  Is this a
concern in
this application?  Or should I just isolate everything via CMOS logic?
I need to turn
off the power of the other 3 Pics to conserve power.  Pic #1 is the only
Pic that
will always have power and be ether sleeping or awake. Thanks for your
help...

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Work all day & night,
deliver on time & on budget,       Regards,
and justice for all...             Bill Bryson