If you don't need an interrupt for your RS-485 communications then I would bit bang this on another pin, and keep the usart free for the RS-232. The project that I am working on presently requires three ports, but as only one of them needs to fire an interrupt I have had no problem keeping the other communications separate. I'm using a 16f877a, but the '88 should work just fine. I needed a lot of I/O, that's why I moved up to the '877. I don't know when I will receive data on the main RS-232 link, so that is interrupt driven, while all of the other devices connected wait until the Pic talks to them, and then respond. I hope this helps.

Jerry.