IBM 5170 Technical Reference page 348

FSTSWAX
=
Store Control Word
Store Control Word
1 escape 111 111100000
FLDCW
=
Load Control Word
Load Control Word
1
escape
001
1 mod 101
rim
FSTCW
=
Store Control Word
Store Control Word
1
escape
001
1 mod 111
rim
FSTSW
=
Store Status Word
Store Status Word
1 escape 101 1 mod 101
rim
FCLEX
=
Clear Exceptions
Clear Exceptions
1 escape 011 111100010
FSTENV
=
Store Environment
Store Environment
1 escape 001 1 mod 110
rim
FLDENV
=
Load Environment
Load Environment
1 escape 001 1 mod 100
rim
FSAVE
=
Save State
Save State
1 escape 101
1 mod 110
rim
FRSTOR
=
Restore State
6-30 Instruction Set