0 REM PLOT WAVE DEMO
   10 N=0:FRAME POSITION 50,15
   20 FRAME COLOR 10:FRAME GRID 32,32
   30 DO
   40 Y=SIN(N/7)
   50 FRAME CLEAR
   60 PLOT COLOR 4
   70 PLOT WAVE $B000,Y*30+64
   80 PLOT COLOR 6
   90 PLOT WAVE $B100,Y*40+128
  100 INC N
  110 LOOP