[036] Function Calls! - Building a CPU From Scratch

Опубликовано: 20 Март 2025
на канале: rj45 Creates

965

Let's get function calls working, and while we are at it, let's also expand out to 16 registers. I also show the debug bus which simplifies quite a lot.

This is in a CPU built from scratch using Digital, a digital logic simulator we can use to build a CPU that can run on an FPGA.

If you would like to support this work and encourage me to make more videos:
https://ko-fi.com/rj45_creates

See the project on github here: https://github.com/rj45/rj32
Get the program I am using here: https://github.com/hneemann/Digital/r...
Get the assembler I am using here: https://github.com/hlorenzi/customasm

00:00 - Intro
01:30 - Debug Bus
04:08 - Github!
05:13 - Ramifications
06:03 - Shadow Registers
06:50 - Execute Simplifications
07:24 - 16 Registers
10:02 - Write Mux Split
14:31 - Microcode Update
17:25 - Debugging
18:55 - Found the Bug
19:42 - Returning
23:20 - Final Testing

Digital Logic Introduction:
Exploring How Computers Work -    • Exploring How Computers Work
How Do Computers Remember? -    • How Do Computers Remember?

Deeper dive into how to build a computer from scratch:
Ben Eater's 8-bit Breadboard Computer -    • 8-bit computer update