This service runs BASIC programs submitted by a tweet on an emulated BBC Micro and returns an animated GIF image of the screen (2secs @ 50 fps).
Technically, the bot runs a BBC Micro Model B with BBC BASIC II and the Acornsoft Graphics Extension ROM. It’s pretty amazing what can be done with a single tweet, e.g., https://twitter.com/bbcmicrobot/status/1226952084823605248
One of the fun and challenging aspects of the bot is you need to squeeze your BASIC code into a tweet - code golf! You might want to use fewer and smaller line numbers, fewer spaces and check out the minimum abbreviations for BBC BASIC keywords to achieve this.
You can create some cool animations and graphics using these techniques but the code will become harder to read. Below you can see an example of minifified BBC BASIC. Click the thread to see the resulting image!
Now you can beep from bed or on your commute, Twitter handle @bbcmicrobot.