The code is (or can be) the same either way. I imagine after a few days the user would memorize the codes for the letters and skip the prompts. On a related no

The code is (or can be) the same either way. I imagine after a few days the user would memorize the codes for the letters and skip the prompts. On a related note, one character per minute is about the same speed as the first trans-atlantic telegraph cable in 1858.