I didn't have the schematic handy (in fact I never did one), but as its such a simple PCB, I figured the PCB layout would double nicely as a schematic.
I designed this to work with the PIC16x series of processors but I have actually only tested it with PIC16F87x and PIC16F87xA processors. In theory it should work with the rest of the PIC16x series of processors.
You can either use a jumper, or a switch to select between the type of processor fitted. The silk screen lettering is correct for jumpers, if you use a switch it will probably be reversed.