TM5-6675-326-146-4 DESCRIPTION AND USE OF OPERATOR’S CONTROLS AND INDICATORS - ContinuedKeyC o n t r o l o r I n d i c a t o rFunctionS u b t r a c t a r i t h m e t i c/~:S u b t r a c t s n u m b e r inX<O?k eyX-memory from number inY-memory.X<ol:Used in programsto compare number inX - r e g i s t e r t o 0 .I f x i sl e s s t h a n 0 , c a l c u l a t orperforms next programs t e p.I f X i s n o t l e s st h a n 0 , c a l c u l a t o r s k i psnext program step.A d d a r i t h m e t i c / h o u r s ,minutes, seconds keyRt/R4roll stack keyX~Y/X~Im a n i p u l a t i onkey+:Adds number in X-register to number inY - r e g i s t e r .H.MS+:Adds hours,minutes, and seconds, ordegrees, minutes, andseconds in the Y-registerto those displayed in theX - r e g i s t e r .D1: I n s t r u c t s c a l c u l a t orto roll down contents ofautomatic memory stack (X,Y, Z, and T) intoX - r e g i s t e r.Each time newnumber is displayed, oldone moves to top of stack.First value moved is inY - r e g i s t e r .R4:I n s t r u c t s c a l c u l a t ort o r o l l u p c o n t e n t s ofautomatic memory stack (X,Y, Z, and T) intoX - r e g i s t e r , s t a r t i n g w i thnumber In T-register .El’Interchanges numbersin X- and Y-memory registers.X ~1:Interchangesnumbers in X- and I-memoryr e g i s t e r s .6-17
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