INT 09 - CPU-generated (80286,80386) - PROCESSOR EXTENSION PROTECTION ERROR
Desc:   called if the coprocessor attempts to access memory outside a segment
boundary; it may occur at an arbitrary time after the coprocessor
instruction was issued
Note:   until the condition is cleared or the coprocessor is reset, the only
coprocessor instruction which may be used is FNINIT; WAIT or other
coprocessor instructions will cause a deadlock because the
coprocessor is still busy waiting for data

See also: 07

09 - CPU-generated (80286,80386) - PROCESSOR EXTENSION PROTECTION ERROR