If anyone can help identify these ICs I would be ever so appreciative -- the most I've found so far is they are Denso:
First up 64 pin IC with the following numbers on it:
D151803-3260
7433-1673
2L1315
And another very similar 64 pin IC:
D151803-4650
7433-1686
2K1322
And finally a 42 pin IC:
D 151802-4971
572 158N
9302 Z34
Picture of all three:
http://www.natesbox.com/gfx/HardwareDev/IMG_1741.JPG
Thanks!