1. In the early days, how did the program enter the computer?
Programs must be entered into the computer manually. In the early days, computers had no concept of memory. People entered data (numbers) into the computer through physical means such as punched paper cards.
2. Early computer programming
- Punch paper card/paper tape: punch holes in the paper card, use a card reader to read the connected circuit, and perform programming. The reason is that punched paper cards are cheap, reliable and easy to understand. 62500 paper cards = 5MB data
- Plug-in board: Change the connection method between devices by plugging and unplugging lines for programming.
- Panel switch (before 1980s): Programming is performed by flipping the switch on the panel. Enter the binary operation code, press the store button, advance to the next memory bit, until the memory is operated, press the run button to execute the program. (memory computer)
3. Modern computer infrastructure-Von Neumann computer
The symbol of a von Neumann computer is a processor (with an arithmetic logic unit) + data register + instruction register + instruction address register + memory
Article from: [Computer Science Crash Course] Notes