READY FOR THE NEXT CHAPTER?
You now understand:
- ✅ What physical components are inside a computer
- ✅ How components communicate via buses
- ✅ The role of the motherboard, CPU, RAM, storage, and GPU
- ✅ Why there's a firmware layer separate from the OS
- ✅ The privilege boundary between kernel and user mode
- ✅ How abstraction and layering organize complexity
Next chapter: Chapter 2 — CPU Internals
In Chapter 2, you'll dive deep into how the CPU actually executes instructions: what happens inside when the CPU processes a single instruction.
CHAPTER SUMMARY FOR QUICK REFERENCE
What you learned:
| Topic | In one line |
|---|---|
| Layers | Electricity → hardware → firmware → OS → applications |
| Key components | CPU (processor), RAM (fast memory), storage (permanent), GPU (graphics), motherboard (connector), chipset (hub) |
| Buses | PCIe for GPUs, USB for peripherals, SATA/NVMe for storage |
| Privilege | Kernel mode (trusted code) vs User mode (applications), separated for security |
| Abstraction | Each layer hides complexity from the layer above |
| Concurrency | Multiple things happen at the same time |
Key diagram:
PSU → Motherboard → (CPU, RAM, Chipset)
↓
(GPU, Storage, NIC, Audio)
Read it like a family tree: power flows into the motherboard, which feeds the CPU, RAM and chipset. The chipset then links the GPU, storage, network and audio.
REFERENCES AND RELATED CHAPTERS
- Extends: None (this is foundational)
- Required for: All following chapters
- Related concepts: Chapter 2 (CPU), Chapter 3 (Memory), Chapter 4 (Hardware communication)