 AY  . AY  "",   14h, 15h.
 AY:
   ~500,  ~1,  ~2.
   = 7.
 - () ""  "" R13 = 0Ah,   R12R11 = 9FFFh.

:
"1", "2", "3" - /  ,,.
"4" - /     .
"0" - mute.    7h  3Fh.

  ( Emu):
    07h
      (   ).
    R8,R9,R10   15h.

     .
