Control Keys

[CONTROL][A]	Cancels last character typed; moves cursor back one space.
[CONTROL][Q]	Erases current line.
[BREAK]	Interrupts anything in progress and returns to command level.
[ENTER]	Signifies end of current line.
[SPACEBAR]	Enters a space (blank) character and moves cursor one space forward.
[SHIFT][@]	Causes currently executing program to pause (press any key to continue).
[SHIFT][0]	Causes letters to be printed reversed (on the display) or lowercase (on the line printer).