Add mmphosis' RAINBOW mode change demo

https://macgui.com/usenet/?group=2&id=22342#msg

RAINBOW.BAS

@@ -0,0 +1,44 @@
+10 A = 9200 
+ 20 B = 13136 + 32 
+ 30 C = 100 
+ 40  TEXT : HOME 
+ 50 DATA 173,87,192,173,83,192,173,84,192,173,80,192,208,251,173,86,192,160,22,136,208,253,234,173,87,192,76,9,3
+ 60  FOR I = 768 TO 796 
+ 70  READ N: POKE I,N 
+ 80  NEXT 
+ 100  HGR : POKE  - 16302,0 
+ 110  HCOLOR= 4 
+ 120  HPLOT 0,0: CALL 62454 
+ 130  HCOLOR= 2 
+ 140  HPLOT 0,63 TO 279,63 
+ 150  HPLOT 0,62 TO 279,62 
+ 160  HCOLOR= 6 
+ 170  HPLOT 0,61 TO 279,61 
+ 180  HPLOT 0,60 TO 279,60 
+ 190  HCOLOR= 1 
+ 200  HPLOT 0,59 TO 279,59 
+ 210  HPLOT 0,58 TO 279,58 
+ 220  HCOLOR= 5 
+ 230  HPLOT 0,55 TO 279,55 
+ 240  HPLOT 0,54 TO 279,54 
+ 250  HCOLOR= 0 
+ 260  HPLOT 0,123 TO C,123 
+ 261  HPLOT 0,122 TO C,122 
+ 262  HPLOT 0,119 TO C,119 
+ 263  HPLOT 0,118 TO C,118 
+ 270  COLOR= 0 
+ 280  FOR I = 0 TO 39 
+ 290  VLIN 0,39 AT I 
+ 300  NEXT 
+ 310  COLOR= 13 
+ 320  HLIN 0,39 AT 14 
+ 330  FOR I = 0 TO 7 
+ 340  POKE A + I,0 
+ 345  POKE B + I,0 
+ 350  NEXT 
+ 360  COLOR= 1 
+ 370  HLIN 0,39 AT 13 
+ 380  VTAB 21 
+ 390  PRINT  TAB( 16)"RAINBOW" 
+ 400  PRINT : PRINT "MIXED GRAPHICS (HI-RES/COLOR)" 
+ 500  CALL 768