Reads a character from the keyboard.
INKEY
None.
INKEY returns a NULL string if there is no character to return. For standard keys, INKEY returns a 1-byte string containing the character read. For extended keys, INKEY returns a 2-byte string made up of the NULL character (ASCII 0) and the keyboard scan code.
PRINT "Press Esc to exit..." DO LOOP UNTIL INKEY = CHR(27) ’27 is the ASCII code for Esc.