How Computers Work: Processor and Main Memory
Computers are the most complex machines that have ever been created. This book will tell you how they work, and no technical knowledge is required. It explains in great detail the operation of a simple but functional computer. Although transistors are mentioned, relays are used in the example circuitry for simplicity. Did you ever wonder what a bit, a pixel, a latch, a word (of memory), a data bus, an address bus, a memory, a register, a processor, a timing diagram, a clock (of a processor), an instruction, or machine code is? Unlike most explanations of how computers work which are a lot of analogies or require a background in electrical engineering, this book will tell you precisely what each of them is and how each of them works without requiring any previous knowledge of computers, programming, or electronics. This book starts out very simple and gets more complex as it goes along, but everything is explained. The processor and memory are mainly covered.
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1,0 pattern A1 and A0 address of instruction address to address address values 0000 address wires battery bit address values bit values bits go Bits Left bits of latch bits to change bits to copy change instr.addr.and rot.amount circuitry clear key clear register controls light copy all bits copy data copy NO bits data bus data was copied data wires delay line diagram above shows electromagnet enable key go to instr_3 input wire instr_3 instr_3’s from addr instr_4 instr_5 instr.addr.and rot instr.addr.and rot.amount instruction_2 instruction 0001 instruction_1 0100 key is pressed label address data latch bit address light B comes light bulb light G loop 1 controls machine language NAND gate normally closed key normally closed relay normally open key Press the enable pressed to clear pressing key processor register 111 register key rightmost bit rot.amount instruction_2 1000 rotated bits temporarily pressed transistors truth table wire D1