=> R0 = mask for features word
R1 = value for features word
<= R0, R1 preserved
This SWI checks the capabilities of the printer. If (R0 AND features word) = (R0 AND R1) then the SWI returns immediately. Otherwise an error is generated if the printer does not support the requested features (so no error is generated if you request only axis preserving rotations, and the driver can actually perform arbitary rotations).
See PRM 3, page 608.
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