YEAR 1 CO1 WEEK 10 LITTLE MAN COMPUTER

Question 1

LOAD

Answer 1

LDA
Machine code 5xx
Loads contents of address xx onto the accumulator.

Question 2

STORE

Answer 2

STA
Machine code 3xx
Stores the contents of accumulator to address xx

Question 3

ADD

Answer 3

ADD
Machine code 1xx
Adds contents of address xx to the accumulator.

Question 4

SUBTRACT

Answer 4

SUB
Machine code 2xx
Subtracts contents of address xx from the accumulator

Question 5

INPUT

Answer 5

INP
Machine code 901
Copies value from the “in box” onto the accumulator.

Question 6

OUTPUT

Answer 6

OUT
Machine code 902
Copies value from accumulator to the “out box”

Question 7

END

Answer 7

HLT
Machine code 000
Stops LMC simulator executing the program

Question 8

BRANCH ALWAYS

Answer 8

BRA
Machine code 6xx
Sets program counter to address xx

Question 9

BRANCH IF ZERO

Answer 9

BRZ
Machine code 7xx
If contents of accumulator are ZERO set program counter to address xx

Question 10

BRANCH IF ZERO OR POSITIVE

Answer 10

BRP
Machine code 8xx
If contents of accumulator are ZERO or POSITIVE set program counter to address xx

Question 11

DATA STORAGE

Answer 11

DAT
No machine code
Reserve as data the memory address reached when this instruction is compiled