NEXT j,i syntax! You should post a tip about that. 3) It took me a while to realize why printing a newline after the j loop wasn't necessary--it always goes to a new line because the next line's tab stop is <= the previous line's length (and that's only true because there's a space after the A on the first line). Brilliant!
QBasic 1.1, 68 bytes
An anonymous function that takes input as keystrokes and loops forever, printing the character corresponding to each keypress to the corresponding location in the ASCII Table.
CLS
DO
s$=INPUT$(1)
x=ASC(s$)-16
LOCATE x\16,2*(x MOD 16)+1
?s$
LOOP
