Technology Square
Tech Square was the nickname for the building at MIT which housed Project MAC, which later split into the AI Lab and the ]]MIT Laboratory for Computer Science|Laboratory for Computer Science]] (including the Dynamic Modeling, Mathlab, and Macsyma Consortium groups). The machine room was on the top (9th) floor.
Layout
Later on, space around the outer walls where CTSS/Multics machines used to be was turned into enclosed offices; the remainder of that space was use to hold the MIT-MC KL10 ITS machine.
The MIT-XX DECSYSTEM-20 TOPS-20 machine was installed where it says '1401'. The MIT-DM KA10 ITS machine was between the DM PDP-6 and the MIT-ML KA10 ITS machine, and also along the outer wall behind the PDP-6.
The ARPANET IMPs were along the outer wall where it says '1401'.
As the other end, the offices 919-922 were done away with, and that all became open raised floor, initally holding various robot arms, the Xerox Graphics Printer, etc, etc; later CADR Lisp Machines were there. The AI ITS KA10 was later replaced with the MIT-OZ TOPS-20 DECSYSTEM-20.