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  1. I wrote a series of blog posts/articles on Commander X16 architecture and coding. I have started with focus on beginners and then slowly moved to more advanced topics and techniques. First I tackle smaller chunks and use simple examples to show the topic in practice. After enough new knowledge is covered I write a complete game to utilize several of the techniques to illustrate how it all comes together so each new complete project is more complex than the one before. I do cover only Commander X16 specific so I recommend reading Commodore C64 BASIC tutorials and guides. Please note that the games and most examples are written with a goal to be as clearly readable and understandable so there is very little source code optimizations. Snake Game This game is written in very clean BASIC with very little trickery so not much special Commander X16 knowledge is required. We do VPOKE directly into video memory so only understanding of fundamentals is required. Recommended reading VERA Overview Topics Covered in Game Analyzing the game itself is a great way to learn basics like: How to structure source code (outer loops, game loop) What is Game loop Use of Data structure like multiple Arrays How to read Joystick, Keyboard How to use VPOKE to “talk to” VERA Video RAM organization and using colors Writing to certain location on the screen Using PETSCII control characters to display messages and title screen GOTO Crazy Snake Tutorial GOTO Download Tetris Clone This game introduces some more advanced features of Commander X16 and we have to take a bit more care of how to use data structures and optimize some parts of the game to make it playable. Recommended reading VERA Overview Tiles in Basic I - Video Modes 0 and 1 Colors and Palettes Topics Covered in Game Tetris clone requires us to improve on pretty much all parts of the snake game structure: We have additional loops outside and inside game loop Advanced game collisions based on screen state Pre-calculate relative positions of four segments of each tetromino Customize color palette Customize tiles (characters) Speed increase per level Adding sound to the game GOTO Crazy Tetrominoes Tutorial GOTO Download Boulder Dash style game With this game we are using most of the Commander X16 hardware capabilities and we are getting close to squeezing most out of it for BASIC games. We have to pay close attention to timings, synchronizing scrolling and animation, take care of different types of collisions, etc. Recommended reading VERA Overview Tiles in Basic I - Video Modes 0 and 1 Sprites in Basic I - Setup Sprites in Basic II - Animation Scrolling and Layers in BASIC Colors and Palettes Simplest Sound Effects Library for BASIC Font Library for Commander X16 Topics Covered in Game This game is taking advantage of hardware features of Commander X16 to the level it almost looks like 16bit game or something written in Assembly for 8 bit computer like: Two phase approach to development Full color mode Full screen scrolling Two layer graphics Scrollable playfield Static HUD Animated full color sprites 256 color title screen in graphics mode Advanced physics and game mechanics Loading assets to memory from binary files for: Tileset Sprite Sheet Fonts Sound effects library Title screen GOTO Crazy Boulders Tutorial GOTO Download
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