ENTER is Enter number in X register into Y register (and disable stack lift)
X< >Y is Exchange X and Y registers.
X< >M is Exchange X and Memory Registers
CLST is Clear Stack
CLX is Clear X register (and disable stack lift)
CHS is Change Sign of X register RDN is Roll Down
(Roll Stack Down) RUP is Roll Up (Roll Stack Up) MS is Memory Store
(Stores X register into Memory Register)
MR is Memory Recall (Recalls Memory Register and stores his value into X register)
MC is Memory Clear M+ is Add Register X to Memory contents
M- is Substract X register from Memory Contents