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2 revisions	giulianaangotti at Nov 08, 2020 01:32 PM	Compared with
Nov 08, 2020 giulianaangotti Mar 30, 2018 Stanford University Archives	139 OX, V15 10:57 22-FEB-68 PAGE 30 FROM MUP AND PUP, MUP AND PUP LOAD WHEN UPDATE IS CALLED, U1 HAS ONLY THE PIECE MOVING SET U2, CONTAINS UPDATE USES THIS NUMBER TO DETERMINE REGISTER I HAS BITS SET TO ENABLE THE WORD IN THE CASE OF BRANCHING S A, P, AND K MUST BE LOADED WITH N BEFORE EITHER MUP OR PUP IS CALLED ;ADD 1 TO RETURN ADDRESS ;A IS NOW PASSIVE & P IS NOW ACTIVE ;IS PIECE MOVING A KING? ;YES ;SKIP IF U2 GREATER THAN 0 ;SET FORWARD BIT ;SET BACKWARD ;ZERO BIT'S POSITION ;DO IT AGAIN & TEST FOR JUMP ;SET JUMP FLAG ;SHIFT AGAIN BY MAGIC NUMBER ;SET DESTINATION BIT ;SO THAT "IDNN" CAN BE USED 5 LINES DOWN ;DOES PIECE WANT TO BE A KING? ;NO ;IS PIECE ALREADY A KING? ;NO, SO TURN OFF JUMP FLAG ;IS PIECE A KING? ;YES, SO ST DESTINATION BIT ;WAS MOVE A JUMP? ;NO, SO RETURN ;KLUDGE RESET ;HAVE MULTIPLE JUMPS ALREADY BEEN FOUND? ;NO ;YES, BUT FROM PREVIOUS MOVE? :YES ;BUILD MASK WORD IN U3 ;PIECE CAN'T MOVE FORWARD ;RF POSITION is column is picking up bits? B.P.	139

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Stanford Letters Project

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