Fundamentals of Computer Science

Definition: Microprocessors are essential components in modern computers, functioning as the brain of the machine. They execute programs that are stored in external memory.
Example: Intel's Core 2 Duo microprocessor.

Riddle Presented: 40 + 40 x 0 + 1. Which is correct: 1 OR 41?
Understanding Order of Operations: According to arithmetic rules, multiplication takes precedence over addition, leading to a solution of 41.

Definition: Integrated circuits are assemblies of various components (transistors, resistors, etc.) that are fabricated on a single piece of silicon.
Types:
- Memory ICs
- Digital Signal Processors (DSPs)
- Microprocessors
Presence: ICs are ubiquitous in computer systems and are fundamental to their operation.

Characteristics:
- Contains its own firmware
- Designed with dedicated functionality for specific tasks
- Generally cheaper and less complex than microprocessors.

Pre-1970s: Early computers had separate components wired together.
Post-1970s: Introduction of integrated circuits, leading to the development of microprocessors.
Intel 4004: First commercial microprocessor, characterized as a 4-bit CPU.

Transition to 8-bit Microprocessors: Following the Intel 4004, subsequent microprocessors advanced to 8-bit architectures.
IBM PC: Released in 1981, it featured a 16-bit CPU with an 8-bit data bus; introduced the first Intel 8086 microprocessor of the x86 family.

Composition: Microchips are constructed through layers of metallic tracks laid upon a silicon base.
Photolithography: Used in miniaturization of components; demonstrated in educational videos (e.g., 2008 Royal Institution Christmas Lectures).

Concept: The observation that the number of transistors on a microchip doubles approximately every two years.
Implications:
- Smaller transistors lead to faster computing operations and reduced power usage, although more transistors generate more heat.
- Prediction by Gordon Moore: Initially predicted that the doubling would occur each year for a decade, but it has been observed more realistically in 18-24 month cycles for much longer than ten years.

Visualization (1971-2011): Graphs indicating the doubling pattern for transistor counts on various processors.
Significant Milestones:
- Intel 4004 (1971): 2,300 transistors
- Core i7 (multiple versions) and others leading up to 2011 count reaching out to billions of transistors.

Limitations: Discussions on the potential end of Moore's Law.
Emerging Technologies: Molecular electronics and quantum computing as new frontiers for technological advancement.

Architecture: Following the von Neumann architecture, CPUs operate using a cycle of fetching and executing individual instructions.
Instruction Sequence:
1. Fetch: Load the address of the next instruction onto the address bus.
2. Decode: Interpret the instruction fetched.
3. Execute: Carry out operations based on decoded instructions.
4. Store Result: Save the result to memory or a register if necessary.

Memory Address Register (MAR): Holds addresses to be loaded onto the address bus.
Control Unit (CU): Orchestrates the sequence of operations to execute each instruction correctly.
Instruction Pointer (IP): Contains the address of the subsequent instruction to be fetched.
Instruction Register (IR): Stores the most recently fetched instruction.

Concept: A technique where the CPU overlaps the execution of instructions to increase instruction throughput.
Clock Speed: CPUs operate at a clock speed measured in cycles per second; for example, the Intel Core i9 can reach 5.5 GHz.
Operation: During pipelining, the CPU can perform different stages of execution for multiple instructions simultaneously, leading to faster processing.

Technology Development: New architectures allow for more cores on a single die, enhancing processing capabilities.
Notable Models:
- AMD Ryzen Threadripper series is highlighted for powerful desktop processors, such as the 3970X model which introduced 32 cores in 2017.
- As of 2024, the 7995WX features 96 cores with a noted price point of $9999.