A friend grounded the PALs (as per Larry's reply) on my daughterboard and
it certainly made my Supra coexist much more happily with my Cltd memory.
Back then the Supra ran OK without the memory and mod though, but maybe
mine's more tolerant. When I put the daughterboard back I just attached the
other end of the new ground wire to one of the big screws that hold the
motherboard into the case – it looked like it that would put it in nice
contact with the motherboard's ground.