separate alpha Example
10 MERGE ALPHA WITH GRAPHICS
20 CLEAR SCREEN
30 PRINT "With Alpha and Graphics merged, the text and"
40 PRINT "graphics should disappear with a CLEAR SCREEN"
50 PAUSE
60 MOVE 0,60
70 AREA PEN 4
80 RECTANGLE 30,30,FILL
90 WAIT 2
100 SEPARATE ALPHA FROM GRAPHICS
110 CLEAR SCREEN
120 PRINT "This text should disappear with a CLEAR SCREEN"
130 PRINT "The square should not be erased"
140 MOVE 0,60
150 AREA PEN 7
160 RECTANGLE 30,30,FILL
170 WAIT 2
180 CLEAR SCREEN
190 WAIT 1
200 PRINT "Notice the square is not erased!"
210 END
