The built-in software in ELLO 1A can be roughly divided into three main parts: system functions, RIDE shell, and C.impl interpreter.
The system functions are a set of various hardware-dependent functions, completely transparent to the user, and dealing with the overall operation of the hardware, such as producing the video signal, various timing routines, handling the file allocation system on the storage drives, etc. These are the only parts in the entire firmware, which are hardware-dependent.