LAB 3 PART 1

 For this lab we were tasked with creating a simple game or using open source code and adding some of our own code to it. The lab is based on the 6502 assembler and is written in assembly language, for this task I found a classic game of snake that is written in assembly and it is a little complex but I was able to follow it and make a few changes. 

Green highlight is my code and edits, Blue code is important to user input and movements

Source material: https://skilldrick.github.io/easy6502/#snake


THE CODE


;  ___           _        __ ___  __ ___

; / __|_ _  __ _| |_____ / /| __|/  \_  )

; \__ \ ' \/ _` | / / -_) _ \__ \ () / /

; |___/_||_\__,_|_\_\___\___/___/\__/___|


; Change direction: W A S D


define appleL         $00 ; screen location of apple, low byte

define appleH         $01 ; screen location of apple, high byte

define snakeHeadL     $10 ; screen location of snake head, low byte

define snakeHeadH     $11 ; screen location of snake head, high byte

define snakeBodyStart $12 ; start of snake body byte pairs

define snakeDirection $02 ; direction (possible values are below)

define snakeLength    $03 ; snake length, in bytes

define snakeLengthTwo $04 ; snake length, in bytes


; Directions (each using a separate bit)

define movingUp      1

define movingRight   2

define movingDown    4

define movingLeft    8


; ASCII values of keys controlling the snake

define ASCII_i      $69

define ASCII_j      $6A

define ASCII_k      $6B

define ASCII_l      $6C


; System variables

define sysRandom    $fe

define sysLastKey   $ff



  jsr init

  jsr loop


init:

  jsr initSnake

  jsr generateApplePosition

  rts



initSnake:

  lda #movingLeft  ;start direction

  sta snakeDirection


  lda #4  ;start length (6 segments)

  sta snakeLength

 sta snakeLengthTwo

  

  lda #$11

  sta snakeHeadL

  

  lda #$10

  sta snakeBodyStart

  

  lda #$0f

  sta $14 ; body segment 1

  

  lda #$04

  sta snakeHeadH

  sta $13 ; body segment 1

  sta $15 ; body segment 2

  rts



generateApplePosition:

  ;load a new random byte into $00

  lda sysRandom

  sta appleL


  ;load a new random number from 2 to 5 into $01

  lda sysRandom

  and #$03 ;mask out lowest 2 bits

  clc

  adc #2

  sta appleH


  rts



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