Converted from https://sourceforge.net/projects/bcpl-c64/ with Github Copilot/Gemini 3 Pro
Vanilla html/javascript. Serve statically from root.
Currently running at:
https://dagfinndybvig.github.io/onlineBCPL/
Can be used with the classic book:
https://archive.org/details/richards1979bcpl/mode/2up
Note: This is an old dialect of the language. I have created options in the UI to convert to uppercase/old style brackets during upload to accomodate the newer style of BCPL. However, other fixes may or may not be needed to make newer programs run.
To get a feel for the old syntax I recommend taking a look at the file cmpltest.b in the examples, which actually runs in the present system.
If you have Node.js and want to run BCPL on the command line you can try https://github.com/dagfinndybvig/nodeBCPL