Doobrey has it right, the 22 pin header should be on the right end of connector P9B as you are looking at the a1200 m/b with the external ports to the rear away from you (i.e. closest to the internal expansion edge connector). I've never seen a m/b with the left 22 pins but an old Amiga Format issue I have says there were some early C= motherboards that have this problem; there are even some boards that apparently have pins on connector P9A (very early 1MB designated boards that shipped with 2MB chip ram but too late to change the pin connector). fyi, C= planned originally on shipping a 1MB A1200 and selling a 1MB chipram upgrade board that would slot onto P9A. Thank God the engineers won that cost-cutting battle!
