The BBC Microcomputer made by Acorn UK apparently has a central API by which its language ROMs communicated with the hardware inside the computer. This means that by creating a series of shims, one can theoretically run languages such as BBC BASIC on another computer, such as the Apple II.
Thanks to the hard work of Bobbi Webber-Manners, you can now run BBC BASIC and other BBC languages on the Apple II. Here’s how:
Graphics modes aren’t yet supported but all the program logic and text output appears to work fine. Have fun on your BBC Apple!