Well, no, I'm not SURE, but I think so. For example, on the SocketLAN demo board the serial data just comes out of the LAN module, and goes through a MAX232 inverter/level shifter and out to the PC serial connection. The hardware uart on the PIC assumes that you're going through a similar driver IC (I think)... and if you're staying in the TTL world, that would mean an inverter only. I should get my SocketLAN today, so will just wait and set it up on the bench. At least I've decided to use the hardware serial port and the interrupt question has been answered. I'm just going to lay out a small motherboard for the SocketLAN. We'll just answer the inverter question today or tomorrow.