How do computers work? CPU, ROM, RAM, address bus, data bus, control bus, address decoding. 

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0:00 Role of CPU in a computer
0:45 What is computer memory? What is cell address?
1:30 Read-only and random access memory.
2:25 What is BIOS and how does it work?
3:25 What is address bus?
5:18 What is control bus? RD and WR signals.
7:16 What is data bus? Reading a byte from memory.
9:56 What is address decoding?
10:48 Decoding memory ICs into ranges.
11:29 How does addressable space depend on number of address bits?
12:33 Decoding ROM and RAM ICs in a computer.
14:04 Hexadecimal numbering system and its relation to binary system.
16:00 Using address bits for memory decoding
16:45 CS, OE signals and Z-state (tri-state output)
17:35 Building a decoder using an inverter and the A15 line
18:18 Reading a writing to memory in a computer system.
20:46 Contiguous address space. Address decoding in real computers.
21:45 How does video memory work?
22:39 Decoding input-output ports. IORQ and MEMRQ signals.
23:55 Adding an output port to our computer.
25:13 How does the 1-bit port using a D-type flip-flop work?
26:12 ISA и PCI buses. Device decoding principles.

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