Jay Says things
summary
Starts from electromagnetic principles and shows a working CPU built from relays and wires: electromagnetic relays, buffers and junction rules lead to AND/OR/NOT gates, then to a half adder/full adder and an ALU, latches to make registers, buses for multi-bit values and a memory indexed by an address bus. A program counter, instruction register and a three‑phase fetch/decode/execute cycle appear, driven by a hand‑crank clock (waterfall power suggested).
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chapters (23)
- 0:00Introduction
- 1:14Why learn low-level architecture
- 2:37Electrical components and symbols
- 5:26Logic gates with relays
- 8:46Implementing AND and NOT gates
- 10:13OR and XOR logic
- 12:10XOR for binary addition
- 13:40Half adder and full adder
- 15:51Introducing buses
- 16:32Building an arithmetic logic unit
- 17:17Designing a latch
- 19:49Gated D latch
- 22:19Memory with registers
- 23:41Register access selector
- 26:10Memory assembly
- 28:34Registers and memory on bus
- 31:52Address bus for memory
- 33:18Instructions as numbers
- 35:04Fetch-decode-execute cycle
- 36:29Instruction decoding
- 37:51Executing instructions
- 38:32Hand-cranked computer model
- 40:58Q&A
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