1. xerox 560 computer system - The UK Mirror Service

Condition code settings:2 3 4 Result of Comparisonthe other operand is the effective word. The result of thelogical operation is loaded into register R.- a a Contents of R equal to effective word.aContents of R less than effective word.a Contents of R greater than effective word.OROR WORD0Nord index alignment)a a - Contents of Ru 1 equa I to effecti ve word.a - Contents of Ru1 less than effective word.a - Contents of Ru 1 greater than effective word.OR WORD logically ORs the effective word into register R.If corresponding bits of register R and the effective wordare both 0, a a remains in register R; otherwise, a 1 isplaced in the corresponding bit position of register R. Theeffective word is not affected.elMCOMPARE WITH LIMITS IN MEMORY(Doubleword index alignment)Affected: (R), CC3, CC4(R) u EW - R, where a u a = 0, a u 1 = 1, 1 u a = 1,1 u 1 = 1COMPARE WITH LIMITS IN MEMORY simultaneously comparesthe contents of register R with the 32 high-order bitsof the effective doubleword and with the 32 low-order bitsof the effective doubleword, with all three words treatedas 32-bit signed quantities, and sets the condition codeaccording to the results of the comparisons.Affected: CC(R) : ED O_ 31; (R) : ED 32_ 63Condi ti on code setti ngs:2 3 4 Result in R- 0 0 Zero.o Bit 0 of register R is a 1.o Bit 0 of register R is a a and bit positions 1-31of register R contain at least one 1.Condition code settings:2 3 4 Result of ComparisonEOREXCLUSIVE OR WORD0Nord index alignment)- - a a Contents of R equal to most significant word,(R) = ED O_ 31'- 0 Contents of R less than most significant word,(R) < ED O_ 31'a Contents of R greater than most significantword, (R) > ED O_ 31'a a - Contents of R equal to least significant word,(R) = ED _ . 32 63EXCLUSIVE OR WORD logically exclusive ORs the effectiveword into register R. If corresponding bits of registerR and the effective word are different, a 1 is placed inthe corresponding bit position of register R; if the contentsof the corresponding bit positions are alike, a a is placedin the corresponding bit position of register R. The effectiveword is not affected.Affected: (R), CC3, CC4a- Contents of R less than least significant word,(R) < ED 32_ 63.(R) @ EW-Ra- Contents of R greater than least signifi cantword, (R) > ED 32_ 63.LOGICAL INSTRUCTIONSCondition code settings:2 3 4 Resu I tin R- - 0 a Zero.- 0 Bit 0 of register R is a 1.All logical operations are performed bit by correspondingbit between two operands; one operand is in register Rando Bit a of register R is a a and bit positions 1-31of register R contain at least one 1.Logical Instructions 69