$1.$ Perform the calculation $($without calculators$)$ of the following using $2$s Complement. Both numbers are in decimal:

a$.27+88$

b$.69-117$

$2.$ What is meant by Overflow when adding numbers?

$3.$ What is the Condition Code register $?$ What affects it and what is it function $?$

$4.$ Explain line by line what the following $6800$ code does

$$ LDA A $$2000$

$$ CMP A #$$44$

$$ BEQ GO

$$ STA$$ B $$2001$

GO$$ WAI

$5.$

a$.$ What value is XX in the code below:

$$ ADDNXT ADD A$0,$X $$ AB$00$

$$ INX $08$

$$ DEC$$ B$5$A

$$ DEC B$5$A

$$ BNE$$ ADDNXT$26$XX$??$

$$ STA A $$0060$ B$70060$

$$ WAI$3$E

b$.$ What is the BNE opcode $?$

$6.$ Write $6800$ code that performs the following

$$ Loads the index$-$register X with the value$3000$H

$$ Loads Accumulator B with the value at$3002$H$,$ using index addressing.

$7.$

a$.$ What is a Vector$-$table $?$

b$.$ What is a vector $?$

c$.$ Why are some vectors in ROM memory $?$

$8.$ Explain how a RESET$($Bootstrap$)$ operation executes $?$

$9.$ What is the difference between ROM and RAM memory $?$

$10.$What is meant by a Memory Hierarchy $?$

$11.$

a$.$ What is the purpose of Cache memory $?$

b$.$ What is a Cache block $?$

c$.$ What is a Cache Miss $?$

$12.$A memory system has a Cache access time of $3$ ns$,$ Main memory access time of $25$ns and a Hit rate of $75\%.$ What is the average memory access time for the processor $?$