IBM 5150 Technical Reference page 230

Processor Control (Continued)
FLDENV = Load Enviroment
Escape 0 0 1
I
mod 1 0 0 rIm
disp-Iow disp-high
FSAVE = Save State
Escape 1 0 1
I
mod 1 1 0 rIm disp-Iow
disp-high
FRSTOR
= Restore State
Escape 1 0 1
I
mod 1 0 0 rIm disp-Iow
disp-high
FINCSTP
= Increment Stack Pointer
Escape 0 0 1
I
1 1 1 1 0 1 1 1
FDECSTP
= Decrement Stack Pointer
Escape 0 0 1
1 1 1 1 0 1 1 0
FFREE
= Free ST(i)
Escape 0 0 1 1 0 0 0 ST(i)
FNOP = No Operation
Escape 0 0 1
I
1 0 1 0 0 0 0
~
FWAIT
=
CPU Wait for NDP
1 0 0 1 1 0 1 1
Instruction Set 6-23