The memory stack has seven selection pane driver panels with serial numbers 2-8. There is a "Selection Plane Current Control Panel " which has dials indicator lights and switches. There is also a "Fuse and Driver Bias" panel as well as two unlabeled panels that contain vacuum tubes, wired components, and coaxial cables. In the center of the stack is a square column with many wired phenolic boards. Two of the boards have labels reading "side B Y axis; Even-Right Lines; Odd-Read Lines 0-31" and "Side D Y axis; Even-Read Lines; Odd-Right Lines 0-31." Each side has a number label 1-4. Abofve the column there are four phenolic boards with components on them, which are labeled types A-D.