CSC233 Assembly Language - Binary Instructions

Binary RX Instructions (Without Indexing)

The first operand in a binary RX instruction is a register. The second operand is a fullword binary value, aligned on a fullword boundary. The binary instructions include:

L (load a value from memory into a register)
ST (store a value into memory from a register)
A (add a value from memory to a register)
S (subtract a value in memory from a register)

Given the following field definitions:

        FIRST    DS     F
        SECOND   DC     F'50'     (stored in 2's complement: 00000032)
        ONE      DC     F'1'      (stored in 2's complement: 00000001)
        TWO      DC     F'200'    (stored in 2's complement: 000000C8)
        MIN50    DC     F'-50'    (stored in 2's complement: FFFFFFCE)
        NUM      DC     CL4'  99' (stored in EBCDIC: 4040F9F9)
        PNUM     DS     D

The following table shows the results of binary RX instructions. Each set of instructions starts with the initial data given above.

Binary RX Instructions	Before	After
L 4,TWO A 4,ONE	reg 4: (garbage) reg 4: 000000C8	reg 4: 000000C8 reg 4: 000000C9
L 5,SECOND A 5,ONE ST 5,FIRST	reg 5: (garbage) reg 5: 00000032 reg 5: 00000033 FIRST: (garbage)	reg 5: 00000032 reg 5: 00000033 reg 5: 00000033 FIRST: 00000033
L 6,TWO S 6,SECOND A 6,ONE ST 6,FIRST	reg 6: (garbage) reg 6: 000000C8 reg 6: 00000096 reg 6: 00000097 FIRST: (garbage)	reg 6: 000000C8 reg 6: 00000096 reg 6: 00000097 reg 6: 00000097 FIRST: 00000097
L 6,SECOND A 6,ONE ST 6,SECOND	reg 6: (garbage) reg 6: 00000032 reg 6: 00000033 SECOND: 00000032	reg 6: 00000032 reg 6: 00000033 reg 6: 00000033 SECOND: 00000033
L 8,SECOND A 8,=F'256' ST 8,TWO	reg 8: (garbage) reg 8: 00000032 reg 8: 00000132 TWO: 000000C8	reg 8: 00000032 reg 8: 00000132 reg 8: 00000132 TWO: 00000132
L 8,=F'0' A 8,ONE A 8,ONE A 8,ONE ST 8,TWO	reg 8: (garbage) reg 8: 00000000 reg 8: 00000001 reg 8: 00000002 reg 8: 00000003 TWO: 000000C8	reg 8: 00000000 reg 8: 00000001 reg 8: 00000002 reg 8: 00000003 reg 8: 00000003 TWO: 00000003
PACK PNUM,NUM CVB 9,PNUM A 9,TWO CVD 9,PNUM UNPK NUM,PNUM OI NUM+3,X'F0'	PNUM: (garbage) reg 9: (garbage) reg 9: 00000063 PNUM: 000000000000099F NUM: 4040F9F9 NUM: F0F2F9C9	PNUM: 000000000000099F reg 9: 00000063 reg 9: 0000012B PNUM: 000000000000299C NUM: F0F2F9C9 NUM: F0F2F9F9
PACK PNUM,NUM CVB 9,PNUM A 9,MIN50 CVD 9,PNUM UNPK NUM,PNUM OI NUM+3,X'F0'	PNUM: (garbage) reg 9: (garbage) reg 9: 00000063 PNUM: 000000000000099F NUM: 4040F9F9 NUM: F0F2F9C9	PNUM: 000000000000099F reg 9: 00000063 reg 9: 00000031 PNUM: 000000000000049C NUM: F0F0F4C9 NUM: F0F0F4F9

Binary RR Instructions

In a binary RR instruction, both operations are registers. The binary RR instructions include:

LR (copy a value from one register to another)
AR (add a value in one register to another)
SR (subtract a value in one register from another)

Given the following register values and field definitions:

        Reg 2: 00000064   (100₁₀)
        Reg 3: 000000C8   (200₁₀)
        Reg 4: 00000032   (50₁₀)
        Reg 5: 00000001   (1₁₀)

        FIRST    DS     F
        SECOND   DC     F'50'   (stored in 2's complement: 00000032)
        ONE      DC     F'1'    (stored in 2's complement: 00000001)
        TWO      DC     F'200'  (stored in 2's complement: 000000C8)

The following table shows the results of binary RR instructions. Each set of instructions starts with the initial data given above.

Binary RR Instructions	Before	After
LR 6,3 AR 6,4	reg 6: (garbage) reg 6: 000000C8	reg 6: 000000C8 reg 6: 000000FA
LR 5,2 AR 3,5 ST 3,FIRST	reg 5: 00000001 reg 3: 000000C8 reg 5: 00000064 reg 3: 0000012C FIRST: (garbage)	reg 5: 00000064 reg 3: 0000012C FIRST: 0000012C
LR 6,2 AR 6,3 AR 6,4 SR 6,5 ST 6,SECOND	reg 6: (garbage) reg 6: 00000064 reg 6: 0000012C reg 6: 0000015E reg 6: 0000015D SECOND: 00000032	reg 6: 00000032 reg 6: 0000012C reg 6: 0000015E reg 6: 0000015D reg 6: 0000015D SECOND: 0000015D