The defines (name aliases) for registers 0-31 are predefined for for inline assembler. This can be changed with the directive .def.. Registers 0-31 are divided into 8 registers groups. Luna uses none of the registers as constantly entrained status or pointer. It can therefore be used and changed all the registers at any time.

• LA,LB,Temp1 and Temp2: Be used for temporary data within the internal functions.
• HA and HB: Be used as general working registers.
• Low/High-Pointer: Are classified as Type Flags, array index, as an intermediate for shifting on the stack, as a classical pointer to access memory areas, as well as the call and used within internal functions.