http://marc.info/?l=classiccmp&m=104965276917315&w=2 has tms1400 pinout (presumably?) That thread also HAD dark tower pcb pics, but they're long gone. Its possible the person who posted them back in 2001 still has them around somewhere.
LN
"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"