Learnt today that x86 has UD2, a deliberately invalid opcode for testing. It's a big instruction set.
Related Posts
Do any tech streamers try new software live? It'd be a really fun way of doing UX testing.
Today I learnt that Lua projects often use *3* spaces for indentation! https://github.com/luarocks/lua-style-guide/blob/master/README.md#indentation-and-formatting
I initially thought something was very wrong with editor config.
Today I learnt that the original name for DOS was QDOS, for "Quick and Dirty Operating System"! https://en.wikipedia.org/wiki/DOS#QDOS
(Seems rather unfortunate that they dropped the Q.)