Have you ever wanted to develop a playable game small enough to fit into a disk’s 512 byte boot sector? How about watching somebody develop a program in assembly for nearly two hours? If you answered yes to either of those questions, or ideally both of them, you’re going to love this project from [Queso Fuego].
Whether you just want to check out the public domain source code or watch along as he literally starts from a blank file and codes every line for your viewing pleasure, chances are good that you’ll pick up a trick or two from this project. For example, he explains how all of the “graphics” in the game are done in 80 x 25 text mode simply by setting the background color of character cells without printing any text to them.
We really like the presentation in the video after the break, which was recorded over the course of multiple days, judging by the changing light levels in the background. As he types out each line of code, he explains what its function is and gives any background information necessary to explain how it will fit into the larger program. If you’ve ever wondered if you had what it takes to program in ASM, watching this video is a great way to decide.
We’ve all seen Doom played on the Raspberry Pi before… but this isn’t a port of the game. No, this was a school project at the Imperial College of London — writing the game in bare assembly. They wrote it from scratch.
Yep. There’s not even an operating system on the Pi. It’s 9800 lines of bare metal ARM assembly. If that doesn’t hurt your brain we dunno what does!
They are using the official textures from the game, and it’s not quite a perfect replica — but it’s pretty darn close.
Part of the project was to build an emulator to make it easier to test the game, but it didn’t work out the greatest — so most of the actual game development was performed on the actual hardware. Yikes!
Stick around after the break to see Doom in all its former glory. Top notch work guys!
While the most common use for a Raspberry Pi is probably a media center PC or retro game emulator, the Pi was designed as an educational computer meant to be an easy-to-use system in the hands of millions of students. Team 28 at Imperial College London certainly living up to the Raspberry Pi Foundation’s expectations with their bare metal assembly clone of Star Fox, aptly titled PiFox.
This isn’t the first time a college course has taken up the task of developing software for the Pi without an operating system; a few years ago, Cambridge University started that off with a series of bare metal tutorials for the Pi that included drawing graphics on the screen and playing around with USB keyboards. PiFox greatly expands on what those early tutorials could do, reading an NES joystick from the GPIO pins, sound with DMA, and rendering 3D objects.