At 6:06 PM 12/18/96, J. Cabral wrote:
>I know that there is a simple circuit (without using MAX232 or
>4188/4189) to convert RS232 TTL to RS232 C.
>The hardware for communicating from the PC to the PIC is quite simple!
>The circuit for communicating from the PIC to the PC is more complicated
>(I can't remmember it!) it has a MOSFET and same zenners.
>All the hardware needed was once published in ELEKTOR, but I can't seem
>to find it!
>
> Does anybody knows the circuit?

do you have a negative supply?