Opcode. First part of machine language instruction. Specifies which operation needs to be carried out (e.g., addition, store)
- If 2-bit OPCODE, how many different instructions are possible? Four (01 Input, 11 Add, 10 Output, 00 Stop).
- If 8 bit OPCODE? 2^N = 2^8 = 256 different instructions are possible.
Found in lecture Chapter 3 - Hardware 3