6502 Math

Hello, Blog!

If you have just stumbled upon my SPO600 series of blog posts, it has been created to document and share my learnings as I progress through my Software Portability and Optimization college course.

The semester is wrapping up, and I'm working to catch up on my backlog of blog posts - bringing you a sudden throwback to 6502 assembly.

In this post, I'll cover the second lab of the course. The main goal of this lab was getting familiar with performing math operations in 6502 assembly, specifically to animate the graphics on the screen.

• Check out my 1-st post about 6502 Assembly:




• Nice and colourful 6502 reference:

  
  
  
  

  
  
  
  Let's make it bounce
  

  
  
  

  Our goal in this lab is to make the graphic the bitmapped display using 6502 math, instead of resetting after a set number of frames.

  
  
  

  
  
  
  Steps taken:
  

  
  
  

  1. Set the initial position for the graphic: I chose a non-corner starting point, so the graphic can properly bounce around the screen once I am finished with the logic
  
  

  
  
  
  
  

  CODE Kopieren

  ; Set initial position X=Y=0
  
  LDA #$00
  
  STA XPOS
  
  LDA #$05
  
  STA YPOS
  
  

  
  
  
  
  
  
  
  

  
  
  

  
  
  
  
  
  

  
  
  
  Full Solution
  

  
  
  

  
  

  If you’d like to see the complete implementation, feel free to check it out on GitHub.

  
  

  
  
  

  
  
  
  Afterthoughts
  

  
  
  

  Assembly programming is certainly very tedious, especially after stepping away from it for a while (the process of readjusting is very real!). However, the complete lack of abstraction also has its benefits: it forces you to gain an intimate understanding of every tiny detail of the code's logic.

  Vollständiger Original-Bericht

  Ausführliche Details, Code-Beispiele & Hersteller-Stellungnahme auf dev.to.

  ↗ Original-Artikel auf dev.to lesen