The motherboard of the 2600 is dominated by an ominous metal box, likely the EMI shield covering the ICs.

Our efforts to access the brain of the Atari are temporarily thwarted by four metal tabs.

A few short twists with pliers and the EMI shield lifts free.

Atari gets a +1 on repairability for not soldering the shield to the motherboard, as some recent manufacturers have done.