RSX command extensions can be implemented through ROMs (like AMSDOS or other disk operating systems) or by programs.
== Reference documentation Documentation ==
* Reference documentation to write a RSX (assembly-level calls to register one, etc) is supplied in [[Soft968: CPC 464/664/6128 Firmware]] section 10.* [[media:AMSTRAD CPC Les RSX et leurs parametres.pdf|Les RSX et leurs paramètres]] par Philippe (Retropoke) Moulin
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