ECED3204
Assignment 1
Due on Friday, November 27, 2021

Give ​very detailed​ answers to all the following questions
This is a group assignment
Question 1 (1 point):
Design an expanding opcode to allow all the following to be encoded in a 32-bit instruction:

15 instructions with two 12-bit addresses and one 4-bit register number
650 instructions with one 12-bit address and one 4-bit register number
80 instructions with no addresses or registers
Question 2 (4 points):
Compare 0-, 1-, 2-, and 3-address machines by writing programs to compute

X = (A x B + C) / (D − E × B)

for each of the four machines. The instructions available for use are as follows:

M is a 16-bit memory address, and X, Y, and Z are either 16-bit addresses or 4-bit registers. The
0-address machine uses a stack, the 1-address machine uses an accumulator, and the other two have
16 registers and instructions operating on all combinations of memory locations and registers. SUB X,
Y subtracts Y from X and SUB X, Y, Z subtracts Z from Y and puts the result in X. With 8-bit opcodes
and instruction lengths that are multiples of 4 bits, how many bits does each machine need to compute
X?


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