The Von Neumann Machine

Program Counter

Von Neumann Execution Cycle

The Fetch Operation

The Decode cycle

The Increment Cycle

The Execute Cycle

The Repeat Cycle

The Von Neumann Cycles

Input from the Keyboard

Input & Output are bytes long

Output Example

Loading Program

Fetch first instruction

Send character H to output device

Fetch second instruction

Character i is sent to output device

Assembly Language

Trap cases

keywords

Assembler Input, Output and Program output

Pep/8 Compiler

Introduction to Assembly Language Assembly Language Machine Code CHARO 0x0008, d; 0101 0001 0000 0000 0000 1000 CHARO 0x0009, d; 0101 0001 0000 0000 0000 1001 STOP 0000 0000 .ASCII "Hi” 0100 1000 0110 1001 .END --------------------------------------------------------------------------- Instruction specifier hexadecimal address operand specifier operand data