Hi,

The cable length is approximately 2m.

You are right Andy, especially while taking into consideration these links on Transmission Lines:
http://www.csee.umbc.edu/~plusquel...tions1.pdf
http://www.ul.ie/~rinne/ee6471/ee6471%20wk10.pdf
http://www.fairchildsemi.com/an/AN/AN-393.pdf
Notice the paragraph in the middle of page 4 of the last link (from Fairchild):
"In general, when replacing LS components with 54HC/74HC
units, avoid driving buses with a termination network whose
equivalent impedance is less than 500W (worst case) terminated
to VCC or ground, or 250W terminated to 3V."
They're right. Terminationg the line with the exact calculated value for the resistors draws a lot of current. I decided to do the series termination on all lines and Thevenin termination on fast lines but not with the exact calculated value of resistors(200 Ohm). I hope some the reflections are terminated in the end terminator, but should any more transmission line effects occure, they're supposed to be attenuatd in the seies terminator.

Every other wire in the cable is connected to GND on both sides. Two lines are dedicated to VCC and VDD (12v), 8 lines to data from the '245 on the motherboard, 4 lines to LE0..LE3 to the HC573s on the doughterboard, and some other signals.

Best.