=> R0 = 0 (reason code)
R1 = EOR mask
R2 = AND mask
<= R0 preserved
R1 = old value of state
R2 = new value of state
The structure of this call is very similar to that of OS_Byte's between &A6 and &FF the new state is determined by:
New State = (Old state AND R2) EOR R1
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