I need to have a several PIC16F783s talk to each other in pairs over about
40' in the boat. MAX232's come in several flavors. the -30C non-protected chips from TI cost about $1 and the protected Maxim version costs $5. For what I have spent on the boat so far $$45 is no big thing but I would like to know if it is really needed.BTW, you guys goaded me into microcontrollers and after the original frustration I have found assembler is actually kinda fun. When you have spent 30 years trying to write idiot proof application software for imaginative idiots doing it for a silicon chip with no imagination is a joy. :-)