IBM AT 5170 Technical Reference page 397

MF is assigned as follows:
MF Memory Format
00 32-bit Real
01 32-bit Integer
~
10 64-bit Real
11 16-bit Integer
The other abbreviations are as follows:
Term
Definition
Bit =
0
Bit
'" 0
ST Stack top Stack top
(i )= ith register from
the top
d Destination Dest. is ST(O)
Dest. is ST( i )
P Pop No pop Pop
R
Reverse* Dest. (op) source Source (op) dest.
*
When d=l, reverse the sense of R.
Instruction Set 6-29