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diff --git a/104/CH4/EX4.9/4_9.sce b/104/CH4/EX4.9/4_9.sce
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+//incremental encoder
+//2 sinusoidal signals
+//generates four zero crossings per cycle(zc)
+//printwheel has 96 characters on its pheriphery(ch) and encoder has 480 cycles(cyc)
+zc=4    
+ch=96
+cyc=480
+zcpr=cyc*zc  //zero crossings per revolution
+disp(zcpr,"zero_crossings_per_revolution=")
+zcpc=zcpr/ch //zreo crossings per character
+disp(zcpc,"zero_crossings_per_character=")
+//500khz clock is used
+//500 pulses/zero crossing
+shaft_speed=500000/500
+x=shaft_speed/zcpr
+disp(x,"ans=")   //in rev per sec