Today I completed converting the Defender Arcade code to play through all three attract modes. The last one was definitely the hardest as it contains the sprites moving around the screen. I also had to convert how Defender draws the planet surface and get the scanner working. Unfortunately the CoCo 3 doesn’t have enough rows on the screen to match the height of Defender. So I decided to leave the playfield area exactly the same as the arcade version so the play and feel will be the exact same on the CoCo 3. To make room for the scanner at the top of the screen I had to reduce the height of it by half. This should still give me enough room for the player’s reserve ships, smart bombs and score to fit. Click here to see the video of the conversion so far.
Now I can start on the actual game play, hopefully it won’t be so bad since most of the graphics conversion is done and it’s a matter of adding the controls and all the game logic.