001. OCR A Level (H046-H446) SLR1 – 1.1 ALU, CU, registers and buses
About this video
OCR Specification Reference
AS Level 1.1.1a
A Level 1.1.1a
In this video we take a look at the class Von Neuman Architecture of a computer by taking the lid off a processes and examining what is inside and how it works. We discuss important concepts such as the ALU, Control unit, Registers and Buses.
Key question:
- What are the components of a CPU, and what do they do?
00:00 ALU, CU, registers and buses
00:14 Intro
00:19 Main components of a computer
01:01 Internal structure of the CPU
01:20 Control Unit
02:18 Program Counter (PC)
03:06 Memory Address Register (MAR)
03:26 Memory Data Register (MDR)
03:53 Current Instruction Register (CIR)
04:38 Arithmetic Logic Unit (ALU)
05:22 Accumulator (ACC)
06:17 Busses
07:28 How this all relates to assembly language programs
08:37 Key question
08:46 Going beyond the specification
09:04 Other important components of the CPU
09:20 Decode Unit
09:54 Status Register
10:20 Clock
10:59 Interrupt Register (IR)
11:39 Cache
12:17 Outro
Last updated: 18.03.26
