Read The Effective Address
Step 3 is deciding which operation it is. If this is a Memory operation - in this step the computer checks if it's a direct or indirect memory operation:
- Direct memory instruction - Nothing is being done.
- Indirect memory instruction - The effective address is being read from the memory.
If this is a I/O or Register instruction - the computer checks its kind and execute the instruction.
Read more about this topic: Instruction Cycle
Famous quotes containing the words read, effective and/or address:
““When I used to read fairy tales, I fancied that kind of thing never happened, and now here I am in the middle of one! There ought to be a book written about me, that there ought! And when I grow up, I’ll write one—but I’m grown up now,” she added in a sorrowful tone: “At least there’s no room to grow up any more here.””
—Lewis Carroll [Charles Lutwidge Dodgson] (1832–1898)
“I am sorry to think that you do not get a man’s most effective criticism until you provoke him. Severe truth is expressed with some bitterness.”
—Henry David Thoreau (1817–1862)
“Another success is the post-office, with its educating energy augmented by cheapness and guarded by a certain religious sentiment in mankind; so that the power of a wafer or a drop of wax or gluten to guard a letter, as it flies over sea over land and comes to its address as if a battalion of artillery brought it, I look upon as a fine meter of civilization.”
—Ralph Waldo Emerson (1803–1882)