The object is a metal panel made to fit a standard 19 inch rack-mount. On the front of the panel are 16 red indicator lights (all are populated) and 16 white indicator lights (all are populated). Printed on the front of the panel are INDICATOR PANEL MOD II and M.I.T. DIGITAL COMPUTER LAB. A label on the front reads TPD MATRIX. On the back of the object are 2 terminal strips. Attached to the terminal strips is a board containing integrated circuits. A tag attached to the object reads "Whirlwind Stack 6G".
Massachusetts Institute of Technology (MIT) Digital Computer Laboratory