So this is what is stuck in the 11/34 I got: Backplane #1 (working from right to left as seen from the front) M8266 (6) M8265 (6) M8267 (6) M7859 (4) M9312 (2) M7896 (6) M7856 (4) M7228 (4) M920 (2) ** bus jumper ** Backplane #2 M7800 (4) M7800 (4) M7860 (4) M7860 (4) M7892 (4) Dual D/A converters (third party) (6) Grant card M8716 (4) M9202 (2) ** bus jumper ** Backplane #3 M7219 (4) M7821 (3?) M796 (1) (hidden) (2) M9760 (2) M9302 (2) In this last back plane there are several cards that are dual or one wide and are short with white extension things over them so that they can be pushed from the top (but they hide the M numbers) So it seems that this is actually an 11/34a on the inside, that's nice to know. Anyone have any clues on the third backplane? --Chuck