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This figure shows SL4000 addressing, including the Base Drive Module (BDM) and expansion modules added to panels to the left and right of the BDM.
Base Module (BDM): Panel 28 (rear wall) and Panel 29 (front wall), module 15.
Drive Expansion Module (DEM) can be added to the left of the BDM, panels 26 (rear wall) and 27 (front wall), module 14.
Cartridge Expansion Modules (CEMs) can be added to the left or right of the BDM, in the following rear wall/front wall panel locations:
Left of BDM: Panels 24/25 (module 13), 22/23 (module 12), 20/21 (module 11), 18/19 (module 10), 16/17 (module 9), 14/15 (module 18), 12/13 (module 7), 10/11 (module 6), 8/9 (module 5), 6/7 (module 4), 4/5 (module 3), 2/3 (module 2), and 0/1 (module 1)
Right of BDM: Panels 30/31 (module 16), 32/33 (module 17), 34/25 (module 18), 26/37 (module 19), 38/39 (module 20), 40/41 (module 21), 42/43 (module 22), 44/45 (module 23), 46/47 (module 24), 48/49 (module 25), 50/51 (module 26), 52/53 (module 27), 54/55 (module 28), and 56/57 (module 29)