Char code to Emacs string.

[Oleksandr Gavenko]

This code not work because 'make-char' do not understand 'unicode' arg
(which intended to print chars with it unicode code):

(let (i (start ?\x1B6) (end ?\x1B7C))
  (setq i start)
  (while (<= i end)
    (message "%s - %x" (make-char 'unicode i) i)
    (setq i (+ 1 i))
    ) )

How I can get list of possible CHARSET for 'make-char'
and how this code must be fixed to work properly?