The KA10 had a mixture of narrow and wide cabinets. The two main CPU bays were wide (as were the display panels at the top - the one I have is 48 lights wide), as was the MA10 (I think) and MF10 (pretty sure about that one). Other bays (such as the DF10) were narrower (I think standard 19"). I didn't see much of KI10's, so I can't say for sure, but I suspect the same was true of them: I'm pretty sure they used the same DF10, etc as the KA10. Noel PS: Speaking of KI10's, does anyone know the story behind the bizarro images of the 'KI10 Indicator Panels' in the DECsystem-10 System Reference Manual (DEC-10-XSRMA-A-D; 3rd Edition, August 1974 - although other editions may have them too), pg. F1-5? Were those just placeholders that got by editorial control, or was that some sort of complicated in-joke?