LMC Recap

LMC Recap

Lesson 2

What is this?

Mnemonics for LMC

• ADD

• SUB

• STA

• LDA

• INP and OUT

• DAT

• HLT

Then we looked at branching

This allowed us to jump to different parts in our program

Open Ended

What were the 3 types of branching?

Open Ended

We then looked at the addresses of where data is stored. What were the 4 types of addressing we studied?

Open Ended

What were the symbols and which type of addressing did they represent?

Multiple Choice

The LMC performs all THREE except

• Execute

• process

• decode

• fetch

Multiple Choice

What does the accumulator register do?

• This stores data that is being used by the CPU (for example in calculations)
• This holds personal details
• This is used to keep track of all the instructions.
• This is where the instructions are stored

Multiple Choice

What Ends the program (Halt)?

• HALT

• HLT

• END

• STOP

Multiple Choice

What Outputs the number in the accumulator?

• OUT x

• OUTP x

• OUTPUT x

• All of the above

Multiple Choice

What Loads the number in address x into the accumulator?

• LAD x

• Load x

• LDA x

• ID4 x

Multiple Choice

What stores the number in the accumulator to address x?

• STO x

• Store accumulator

• LDA

• STA x

Multiple Choice

What Input a number to the accumulator?

• INT

• INP

• INPUT

• STA x

Multiple Choice

What are the two main types of primary memory?

• RAM & ROM
• HDD & Flash
• Opcode & Operand
• First and Second

Multiple Choice

What does the following instruction do in LMC: 
A DAT 5

• Creates a memory location called B
• Creates a memory location labelled 5 which stores the letter A
• Create a memory location labelled A which stores the number 5
• Creates a memory location labelled C

Multiple Choice

What does the BRA loop do in LMC?

• This will keep looping the program until you stop it.
• This will loop the program until a certain condition is met.
• This will loop the program until the accumulator is 0.
• This will loop the program until the accumulator is negative

Multiple Choice

What is the Mnemonic code for the STORE instruction in LMC?

• STO
• LDA
• STA
• BRA

Multiple Choice

What is the purpose of Memory Data Register (MDR)?

• This holds all the data that needs to be processed.
• This carries out the calculations.
• This holds the location of where the data will be loaded from or stored.
• This register saves information to the hard drive.

Multiple Choice

What is the purpose of the Memory Address Register (MAR)?

• This holds the instruction to be carried out by the CPU.
• This hold the location of where the data is.
• This is used to carry out calculation.
• This is used to keep track of which instruction is next.

Multiple Choice

What is the purpose of the Program Counter (PC) register?

• This is used to hold the instruction that needs to be carried out.
• This is used to save information.
• This is used to hold the location of the data.
• This is used to store the memory address of the next instruction.

Multiple Choice

What is the purpose of the CPU's registers?

• These are used to permanently store data and instructions
• These are used to temporarily store data and instructions.
• They are used to keep track of the CPU speed.
• They are used to check the CPU's processing power

Multiple Choice

What are the two main parts of a program instruction?

• RAM and ROM
• ALU and Control Unit
• Cache and Registers
• Opcode and Operand