In "Alpha mode", the 4010 displays 35 lines of 74 characters. The terminal was "dumb" by standards of the day, lacking various smart terminal features like addressable cursor positioning. The terminal also lacks any significant buffering, and many operations could lead to data loss. Notably, the carriage return took about 100 to 200 µs, and a screen clear operation much longer than that. It was up to the host computer to delay further data to avoid it being lost during these periods.