I have recently updated the design for the 9600 Baud PIC serial interface. The original design which is still on my web site as 'RC to RS232 interface' was a every old design I did in 1993 and used a lots of parts and also a battery to power it.
The new design which can be found at now uses a PIC12C508, less parts and is powered by the serial port.
Please note this is a completely different design to the 19200 Baud one and the PIC HEX files will for each design will not work with the other hardware design.
Ken Hewitt
Http://www.welwyn.demon.co.uk