IBM AT 5170 Technical Reference page 396

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FSAVE
=
Save State
escape 101
I
mod 110
rim
FRSTOR
=
Restore State
I
escape 101
I
mod 100
rim
FINCSTP
=
Increment Stack Pointer
escape 001
11110111
I
FDECSTP
=
Decrement Stack Pointer
escape 001
I
111100110
FFREE
=
Free ST(i)
escape 101
I
11000sT(i)
FNOP
=
No Operation
escape 101
11010000
6-28
Instruction Set

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