Ray,

>> ... to have encountered code where R0, R1, etc 
were not equated to the values they imply.

I have seen code where R0, R1 etc was not equated to 0 1 but defined as
fields- but I have never ever seen code like this (or any other
numbers) 

R0  EQU 4711
R1  EQU 0815
R15 EQU 42

.... 

wait; I once had a colleague who coined the remarkable phrase- 
"if there are not enough registers, you can always equate to some more"

like

R16  EQU  16
R17  EQU  17


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Martin Trübner; everything around "PoOps of z/arch"

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