How use different key config?

Ok, for example -

  1. Sega have 1 type key config
  2. Snes have second type key config

How to automatically load appropriate key config for right console … or maybe is another way ?

Sorr for english

You can use the core-specific config option, which will let you load a different config for each core, and you can map them appropriately.

Thank, Where i can find the “core-specific config option” ?