14. Subtract From (subf): XO-form

subf RT,RA,RB (OE=0 Rc=0)
subf. RT,RA,RB (OE=0 Rc=1)
subfo RT,RA,RB (OE=1 Rc=0)
subfo. RT,RA,RB (OE=1 Rc=1)

31 RT RA RB OE 40 Rc
0  6  11 16 21 22 31

RT  ¬(RA) + (RB) + 1
The sum ¬(RA) + (RB) +1 is placed into register RT.
Special Registers Altered:
CR0 (if Rc=1)
SO OV (if OE=1)
Extended Mnemonics:
Example of extended mnemonics for Subtract From:
Extended: Equivalent to:
sub Rx,Ry,Rz subf Rx,Rz,Ry