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I mean the source code of sysinfo, clock, cobalt etc. Yes I've seen that page, but don't find the codes there....

There are directly linked there, I guess the hyperlink styling is not too obvious: https://benbridle.com/share/sysinfo.br

I think those are the binaries. Opening those on nano/vim shows unreadable characters.

"To assemble a source code file program.brc and save the result as the program program.br, run the command..."

Where are the brc files?

Ah, you're right, I didn't see that.