
There are several fine sites dedicated to this topic so we will only provide linkages.
How to add a Keyboard:
http://thedarkside.ath.cx/dtv/ports.html
General Hacking including Keyboard:
http://www.colmer.info/c64/c64dtv.asp
How to Add S-Video
http://www.rant-central.com/nudge-nudge/s-video
Excellent General Info:
http://www.orrville.net/dtvhacking/personal/
Schematic
http://orrville.net/dtvhacking/64v2schematic.pdf
Jim Brains Site:
http://www.jbrain.com/vicug/gallery/c64dtv?page=8
Misc:
http://home.wanadoo.nl/richard.lagendij ... acking.htm