Tempest Xtreme was joystick only. After I completed Tempest, I had several discussions with Sal about either doing a sequel or putting together a game that can make use of the routines. The concept of the multiplexer was quickly adapted for many future games. I was looking for something that can take advantage of faster line drawing and digital sound effects. Then I came back to see what I can get together for a sequel. I wanted to make a VBXE version of Xtreme, but Sal warned me there would be a very limited market. Then I did some thinking, remember those old PC games that can run on either Mono, CGA, VGA, etc. and said why can't I just make this new planned game capable of running on a real Atari with the original chipset, but have it check for VBXE and if present, replace the player/missile multiplexer with a VBXE blitter routine that puts the sprites in the same X/Y screen positions.
I looked at what else I can do, I always wanted more lanes and be able to set up if they are opened or closed. I payed attention to what people asked about Xtreme, like Lane Highlighting, using different controllers. Sal even wanted to modify some paddle controllers that can continuously go around by replacing the potentiometer inside. With this new game, I added the paddle. Also the track ball and driving controller are present as long as it outputs this "Grey Code" to the Atari computer. I believe some trackballs have "joystick" mode that causes it to act as a joystick moving in a certain direction.
We are preparing to release the game on cartridge and runs on a 64K XL/XE Atari, and does not required extended memory. No release date or price has been decided yet.