=> R0 = reason code
This SWI does a bewildering amount of different things, based on the reason code in R0.
For calls with R0 between 166 and 255:
NewVal = (OldVal AND R2) EOR R1
To read: R1 = 0 R2 = &FF
To set: R1 = new value R2 = 0
See PRM 1, page 54.
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