Question

What is the assembly language equivalent of each of the following binary machine language instructions?

When answering, use w as the label for address 6, x as the label for address 225, y as the label for address 240 and z as the label for address 14.

a) 1100 0000 1111 0000
b) 0011 0000 0000 1110

Answer 1

a) Instruction format:

first 4 bits is opcode and last 12 bits represent address.

1 1 0 0 0 0 0 0 1 1 1 1 0 0 0 0

where 1100 is a operation code 'jumpneq'

0000 1111 0000 represent address which is (128+64+32+16=240) and address 240 is label as 'y'.

jumpneq y

if we not consider label then it is written as

jumpneq 240

b)

0 0 1 1 0 0 0 0 0 0 0 0 1 1 1 0

first 4 bits is opcode and last 12 bits represent address.

0011 is operation code 'ADD'

0000 0000 1110 represent address which is (8+4+2=14) and address 14 is label as 'z'

ADD z  

if we not consider label then it is written as

ADD 14