Question

QUESTION 10 Given the instruction set for MARIE: Instruction Opcode Instruction Opcode Instruction JnSX Load X Store X Add X SubtX Input Output | 8 19 A Instruction Halt Skipcond (00 for AC<0,01 for AC=0, 10 for AC>0) Jump X Clear Addl X Jumpl x write down the machine instruction (binary string of length 16) corresponding to "Add 005". Do not add spaces.

Answer 1

Please up vote ,comment if any query . Thanks.

Answer :

Marie instruction are format 16 bit long .

instruction OPCDOE are 4 bit long and remining 12 bit for address contained by operand

ADD 005

ADD is instruction

005 the address in memory where a value is located

ADD instruction addition the value located at 005 and AC(accumlator)

AC= AC+M[X]   

ADD-> AC+M[X]

opcode of instruction =3 (4 bit ) in binary = 0011

address 005 = 0x005 in binary = 0000 0000 0101

total 16 bit machine code is

machine code in binary = 0011 0000 0000 0101 (16 bit long)

16 bit long string = 0011000000000101 (without spaces)

Please comment if any query . Thanks .