A couple of quick questions to  the PIC Guru's  on the list.

(1)   Is it possible to operate  2  PIC16C84's  on the same  pcb from one
crystal ? (XT mode). The data sheet shows how to use an external clock input
but I am uncertain how to obtain this clock from the other PIC without
loading the  oscillator circuit.


(2)  Somebody on the list  recently indicated that it was  easy to convert
from RS232 to RS485, I have no problem at the PIC level but without
purchasing an expensive RS485 Card for my PC which is  intended  to be the
master controller in a multi-drop system I am having difficulty in enabling
the RS485 driver from a standard PC RS232 port while transmitting  and then
disabling the driver and still be able to listen  for a reply on the PC port.

Thanks in anticipation

Pat Hanson