RE: Transmitter to PC (serial) adapter
For those still interested to build the serial PIC interface, all the required files for the programmer, programming software, as well as the schematics and source code for the PIC 16F84 is available for downloading on [link=http://myweb.absa.co.za/eric.brouwer]my web[/link].
The 16F84 interface is on the Interface page, and the programmer on the Electronics page.
Good luck.