Machine Code

Question 1

What does machine code consist of?

Answer 1

1. Operation code
2. Operand

They are all binary codes

Question 2

What does the binary code do?

Answer 2

01010010001111001

assigns a bit string to each symbol or instruction

Question 3

Instructions consist of …

Answer 3

Operation code followed by operand

Question 4

What is “LD A, 01H”?

Answer 4

individual machine assembly code instruction; 
LD = load, 
A = into register A 
H = hexidecimal 
01 = number 1 

00111110 00000001

Question 5

What does this mean?

“00111110 00000001”

Answer 5

Converted to hexidecimal:
3E
01

Question 6

Name the following:
3E
01

Answer 6

Operation code
Operand
This an example of immediate addressing

Question 7

Steps for INC A (increment A):

Answer 7

Take whatever in A and make 1 bigger:

1. convert to machine code or op code (00111100) or 3C in hexadecimal
2. Placed in RAM for incrementing A

This is called implied addressing because it’s implied that there’s something in register A already

Doesn’t have an operand because it’s implied data is already there; it alters what’s already in register A