Game Physics (in Assembler) - Computerphile

TL;DR

Learn the basics of game logic in assembly language, including CPU fundamentals, registers, program counters, memory fetching, and writing assembly code for basic game interactions.

Transcript

so Matt we have had to chat with you before about assembler and the game that you're writing so what we can look at today we're going to write some basic game logic and assembly language first I'm going to show the basics of the CPU from a programmers point of view so let's invent a CPU it's going to have a logic core and because we're programmers ... Read More

Key Insights

• 👾 Assembly language focuses on CPU fundamentals, registers, and program counters for writing game logic.
• 👻 Memory fetching is an essential aspect of assembly language programming, allowing the logic core to access data from memory.
• 👨‍💻 Assembly code examples demonstrate moving values into registers, performing arithmetic operations, and using jumps and loops for control flow.
• 💄 Assembly language can be practiced using emulators and freeware assemblers, making it accessible for beginners to learn the basics.

Questions & Answers

Q: How are registers used in assembly language?

Registers are small storage areas inside the CPU that hold data for logic operations. In assembly language, you can move values into registers, perform arithmetic operations on them, and store results back into registers.

Q: What is the program counter (PC) used for?

The program counter stores the memory address of the currently executing line of code. It controls the flow of execution by fetching the next line of code to execute.

Q: How does memory fetching work in assembly language?

Assembly language programs can fetch data from memory using the bus, which connects the CPU to other components like ROM, RAM, or a graphics processor. The logic core fetches memory using the program counter to execute instructions.

Q: How can jumps be used in assembly language?

Jumps, like the "go to" command in BASIC, can be used to change the value of the program counter. They allow you to jump to a different line of code or loop back to a previous line, altering the flow of execution.

Summary & Key Takeaways

• Assembly language is used to write game logic, and it focuses on CPU fundamentals, registers, and program counters.

• Registers are small storage areas inside the CPU where logic operations are performed. The program counter (PC) stores the currently executing line of code.

• The assembly code example demonstrates moving values into registers, adding values together, and using jumps and loops to execute code repeatedly.