here are the datasheets for the 16f688, VDIP1, and the command codes for the VDIP1:

16f688 datasheet - http://ww1.microchip.com/downloads/e...doc/41203d.pdf

VDIP1 datasheet - http://www.ftdichip.com/Support/Docu...s/DS_VDIP1.pdf

VDIP1 commands - http://www.ftdichip.com/Firmware/Pre...mware_V205.pdf