The core-12 reader has a serial output at TTL level. So it is a piece of cake to connect and start getting data into your PIC. PBP supports Serial protocol (RS-232) either in software or in hardware. I recommend the second using Hserin command if your PIC has a UART. Note that you need to put a MAX232 chip. The core-12 has inside it an inverter. If you are going to use a PIC with no UART, then use Serin2 command with invert parameters.
Every time you cross a card over the reader, a stream of ascii data are output of the core-12. Have your PIC read the stream into an array and you are done.
More about syntax, examples etc, put the words that you just read into the search of this forum. You will find everything on Serial ports, LCD, ASCII, and us here when you write your code that obviously is not going to run first time! 8-)
Ioannis
Bookmarks