Understanding CPU

a$.$ If a high$-$level language instruction contains a reference to a variable, how will the CPU

get the value of the variable? Describe qualitatively each step: what is the system SW

that helps CPU recognize that something must be obtained from the memory, and

where it is located, what low$-$level instructions are involved and where the value ends

up before being used by the CPU to perform the intended operation with that

variable?

Do not use Chat GPT$!$

b$.$ What is the largest constant that the instruction addi can use?

c$.$ Can addi use negative constants? What binary representation is used for a negative

number? What is lowest negative number that you can encode?