SEATTLE — Saturday, 4:16 p.m., Scoreboard control room at T-Mobile Park.

The ballpark’s brain is located behind home plate, on the 200 level, inside a door that requires a key card to open. It includes two rows of chairs, tables and computer monitors, facing a wall with eight televisions split into 99 smaller screens. A perpendicular row faces the field, where a blue banner obscures a plate-shaped plaque attached to the second deck in center.

More about that in a minute.

One hour and 44 minutes before Ichiro’s number retirement ceremony starts, the scoreboard control room at T-Mobile Park is already occupied. Mariners employees fill seats and stand in aisles — a technical director, a DJ, an audio engineer, seven camera operators, video engineers and editors, stage managers, at least one

See Full Page