Temporary registers w and z, Computer Engineering

Why the temporary registers W and Z are named so I mean we start from A,B,C,D,E then H and L coz H stands for higher bit nd L for lower bit of the address pointed by memory pointer....but what w and z for?

Ans) AS W AND Z ALPHABETS ARE NOT WIDELY USED likewise AS W AND Z IS INTERNALLY USED THEY WOULD HAVE BEEN NAMED SO         

 

 

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