qed will adjust its output to conform to your terminal's screen size. Display updates will be determined by the baud rate if qed is being run from an attached terminal. This will be considerably slower than running qed on a console, xterm etc. Non-ASCII characters (0x00-0x1f and 0x7e-0xff) will be displayed as a question (?) mark. They are saved and manipulated as the characters they really represent. It is only the display which prints them as question marks.
Note: on attached terminals, the column position is NOT updated as you move your cursor. To force an update you must type the <SHOW> key, which on a PC keyboard, is the center key (5) on the numeric keypad when Num Lock is turned off.