Sérgio Pimenta @SBMPimenta
💻️ Rebuilding technology from scratch to understand it. 🛠️ Creating tools and content that make computer fundamentals clear and accessible. spimenta.com Porto, Portugal Joined January 2010-
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I've been busier on my job, that's why there's not much updates lately.
👉UPDATE: RISC-V Simulator - Disassembler (with color syntax highlighting) - Color highlight for register/memory access for the current instruction executed - Ability to edit memory - Now you can load/save memory dump to a file My goal is to make assembly easier to learn!
CPU has no idea what a "function" is. Hardware only knows jumps. Arguments, return values, stack: it's all convention. A function is two things at once: - a way to organize your own thinking, - a set of rules so code from strangers can call each other That's the whole trick.
👉New update about my RISC-V CPU Simulator I've redesigned the ENTIRE user interface! What do you think? Looks much better than before? My goal is to make bare metal programming easy to learn Assembly programming tooling is very bare bones and archaic. I want to change that.
The RISC-V Simulator now has an output My goal is to make learning computer architecture intuitive and accessible: - Visual: See every step of an instructions execution. - Interactive: Explore how data flows through the CPU in real-time. This is just the beginning. Stay tuned!
@wjlroe 12GB? 😱 What matters the most if it works, inefficiencies doesn't matter 🙈
@FroidEtCold You're welcome! This video is very interesting 🙂
Imagine if you scale up what's inside a CPU Watch this video and you can see the MASSIVE scale is build a computer in 1960's UNIVAC 1108 RAM: 328KB - 1.3 MB (Expandable up to 4MB SSD: 1.18MB - 9.44MB (Magnetic drum memory is equivalent to an SSD drive) youtu.be/WedkbWSyT9w?is…
Modern CPUs are logically deterministic, but temporally non-deterministic. You know exactly WHAT your code will do, but because of: - Caches - Pipelines - Branch prediction You never know exactly WHEN. You know 2+2 will be 4, but the CPU decides exactly when you get to see it.
The difficulty in programming in Assembly comes from: - Cognitive load - Lack of safety nets And other things: - Register allocation - Calling conventions - Expression evaluation - Memory management - Optimization I think some of this problems can be fixed! 👇
One of the problems with Assembly is the lack of safety and context. What about adding type safety and ownership to Assembly? Good idea or "you are just reinventing the wheel"? Inspired on #JSDoc #Rust #Type_Script #LLVM_IR
CPUs are very fast, but memory aren't That's why we have caches (L1, L2,L3) out of order execution, branch prediction But this kills determinism You don't know how much time it will take to execute the instructions CPU has to add wait states This list shows the real speed
Fortunately there's a modern SoC that you can truly own Baochip-1x - "Transparent" die chip - Open bootloader - Mostly open RTL (you can simulate the entire chip on your computer) - Memory Management Unit - RISC-V 350MHz - 2MB RAM - 4MB Flash - $10
Building a computer from simple TTL chips is the ultimate form of digital sovereignty Modern systems have hidden processors inside them like the Intel ME They have full access to your RAM, your network card, and your screen. You cannot see them, you cannot turn them off
Modern CPUs run hidden microcode and background tasks you will never know about You don't own them The Z80 and 68k gave us transparency, but production is dead. 6502 how many years will be produced? The only way to truly own a computer today? Build it yourself from TTL chips
✨There's something magical in 80's 8bit computers That feeling of TOTAL understanding and ownership of the machine One person could hold the entire system in their head Modern PCs are unfathomable to a single human mind Out-of-order execution, branch prediction, Intel ME 👇
@wookash_podcast I'm one of those people. Programming for the sake of programming
Hot take: data types don't exist in hardware. Your CPU sees no difference between the integer 65 or the character 'A'. They're all just bits. Every typed language (C, Rust, TypeScript) is just a human agreement about what those bits mean. The CPU is completely indifferent.
As an assembly programmer since 1982, it is great to see the 'shocking' power of asm coding being rediscovered youtube.com/watch?v=IUo0Uw…
Learning how to multiply 2 numbers in a RISC-V CPU that doesn't have a multiply instruction extension (RV32M). Came to a conclusion this algorithm is a bad idea. Need to learn Big-O notation. This helps me to understand the real cost of bad programming practices.
@ThePrimeagen More non developers are developing software via AI = need increase of real developers to fix the slop 😅
My first YouTube video showing my semi-working RISC-V simulator. My English is a bit slow, so you can play at 2x speed 😅 youtube.com/watch?v=LlEQHR…
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